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Finding the Fourth Proportional to 79,391.64, 119,145.78 and 39,909

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Solution

The fourth proportional to 79,391.64, 119,145.78 and 39,909 is: 59,892.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,391.64 : 119,145.78 = 39,909 : x
  2. Step 2: Convert to fraction form
    79,391.64/119,145.78 = 39,909/x
  3. Step 3: Cross multiply
    79,391.64x = 119,145.78 × 39,909
  4. Step 4: Simplify right side
    79,391.64x = 4,754,988,934.02
  5. Step 5: Solve for x
    x = 4,754,988,934.02/79,391.64
  6. Step 6: Final answer
    x = 59,892.82

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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.