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Finding the Fourth Proportional to 643,753.60, 965,630.40 and 420,931.20

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Solution

The fourth proportional to 643,753.60, 965,630.40 and 420,931.20 is: 631,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,753.60 : 965,630.40 = 420,931.20 : x
  2. Step 2: Convert to fraction form
    643,753.60/965,630.40 = 420,931.20/x
  3. Step 3: Cross multiply
    643,753.60x = 965,630.40 × 420,931.20
  4. Step 4: Simplify right side
    643,753.60x = 406,463,963,028.48
  5. Step 5: Solve for x
    x = 406,463,963,028.48/643,753.60
  6. Step 6: Final answer
    x = 631,396.80

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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.