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Finding the Fourth Proportional to 520,914.80, 781,372.20 and 426,436.40

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Solution

The fourth proportional to 520,914.80, 781,372.20 and 426,436.40 is: 639,654.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,914.80 : 781,372.20 = 426,436.40 : x
  2. Step 2: Convert to fraction form
    520,914.80/781,372.20 = 426,436.40/x
  3. Step 3: Cross multiply
    520,914.80x = 781,372.20 × 426,436.40
  4. Step 4: Simplify right side
    520,914.80x = 333,205,548,028.08
  5. Step 5: Solve for x
    x = 333,205,548,028.08/520,914.80
  6. Step 6: Final answer
    x = 639,654.60

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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.