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Finding the Fourth Proportional to 521,121.60, 781,682.40 and 513,248.40

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Solution

The fourth proportional to 521,121.60, 781,682.40 and 513,248.40 is: 769,872.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,121.60 : 781,682.40 = 513,248.40 : x
  2. Step 2: Convert to fraction form
    521,121.60/781,682.40 = 513,248.40/x
  3. Step 3: Cross multiply
    521,121.60x = 781,682.40 × 513,248.40
  4. Step 4: Simplify right side
    521,121.60x = 401,197,241,108.16
  5. Step 5: Solve for x
    x = 401,197,241,108.16/521,121.60
  6. Step 6: Final answer
    x = 769,872.60

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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.