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Finding the Fourth Proportional to 71,640.52, 98,859.40 and 39,807.52

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Solution

The fourth proportional to 71,640.52, 98,859.40 and 39,807.52 is: 54,931.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,640.52 : 98,859.40 = 39,807.52 : x
  2. Step 2: Convert to fraction form
    71,640.52/98,859.40 = 39,807.52/x
  3. Step 3: Cross multiply
    71,640.52x = 98,859.40 × 39,807.52
  4. Step 4: Simplify right side
    71,640.52x = 3,935,347,542.69
  5. Step 5: Solve for x
    x = 3,935,347,542.69/71,640.52
  6. Step 6: Final answer
    x = 54,931.87

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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.