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Finding the Fourth Proportional to 538,921.70, 807,864.15 and 418,912.10

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Solution

The fourth proportional to 538,921.70, 807,864.15 and 418,912.10 is: 627,965.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    538,921.70 : 807,864.15 = 418,912.10 : x
  2. Step 2: Convert to fraction form
    538,921.70/807,864.15 = 418,912.10/x
  3. Step 3: Cross multiply
    538,921.70x = 807,864.15 × 418,912.10
  4. Step 4: Simplify right side
    538,921.70x = 338,424,067,591.22
  5. Step 5: Solve for x
    x = 338,424,067,591.22/538,921.70
  6. Step 6: Final answer
    x = 627,965.19

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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.