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Finding the Fourth Proportional to 657,210.60, 985,815.90 and 421,014.60

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Solution

The fourth proportional to 657,210.60, 985,815.90 and 421,014.60 is: 631,521.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,210.60 : 985,815.90 = 421,014.60 : x
  2. Step 2: Convert to fraction form
    657,210.60/985,815.90 = 421,014.60/x
  3. Step 3: Cross multiply
    657,210.60x = 985,815.90 × 421,014.60
  4. Step 4: Simplify right side
    657,210.60x = 415,042,886,812.14
  5. Step 5: Solve for x
    x = 415,042,886,812.14/657,210.60
  6. Step 6: Final answer
    x = 631,521.90

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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.