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Finding the Fourth Proportional to 657,689,870.00, 907,728,964.20 and 393,400,939.19

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Solution

The fourth proportional to 657,689,870.00, 907,728,964.20 and 393,400,939.19 is: 542,963,246.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,689,870.00 : 907,728,964.20 = 393,400,939.19 : x
  2. Step 2: Convert to fraction form
    657,689,870.00/907,728,964.20 = 393,400,939.19/x
  3. Step 3: Cross multiply
    657,689,870.00x = 907,728,964.20 × 393,400,939.19
  4. Step 4: Simplify right side
    657,689,870.00x = 357,101,427,044,278,912
  5. Step 5: Solve for x
    x = 357,101,427,044,278,912/657,689,870.00
  6. Step 6: Final answer
    x = 542,963,246.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.