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Finding the Fourth Proportional to 657,920.10, 986,880.15 and 421,724.10

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Solution

The fourth proportional to 657,920.10, 986,880.15 and 421,724.10 is: 632,586.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,920.10 : 986,880.15 = 421,724.10 : x
  2. Step 2: Convert to fraction form
    657,920.10/986,880.15 = 421,724.10/x
  3. Step 3: Cross multiply
    657,920.10x = 986,880.15 × 421,724.10
  4. Step 4: Simplify right side
    657,920.10x = 416,191,143,066.62
  5. Step 5: Solve for x
    x = 416,191,143,066.62/657,920.10
  6. Step 6: Final answer
    x = 632,586.15

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.