Home / 642,511.40-963,767.10-405,084.20

Finding the Fourth Proportional to 642,511.40, 963,767.10 and 405,084.20

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Solution

The fourth proportional to 642,511.40, 963,767.10 and 405,084.20 is: 607,626.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,511.40 : 963,767.10 = 405,084.20 : x
  2. Step 2: Convert to fraction form
    642,511.40/963,767.10 = 405,084.20/x
  3. Step 3: Cross multiply
    642,511.40x = 963,767.10 × 405,084.20
  4. Step 4: Simplify right side
    642,511.40x = 390,406,824,689.82
  5. Step 5: Solve for x
    x = 390,406,824,689.82/642,511.40
  6. Step 6: Final answer
    x = 607,626.30

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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.