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Finding the Fourth Proportional to 657,645.70, 985,921.80 and 278,857.30

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Solution

The fourth proportional to 657,645.70, 985,921.80 and 278,857.30 is: 418,054.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,645.70 : 985,921.80 = 278,857.30 : x
  2. Step 2: Convert to fraction form
    657,645.70/985,921.80 = 278,857.30/x
  3. Step 3: Cross multiply
    657,645.70x = 985,921.80 × 278,857.30
  4. Step 4: Simplify right side
    657,645.70x = 274,931,491,159.14
  5. Step 5: Solve for x
    x = 274,931,491,159.14/657,645.70
  6. Step 6: Final answer
    x = 418,054.12

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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.