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Finding the Fourth Proportional to 128,306.52, 177,068.70 and 71,717.94

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Solution

The fourth proportional to 128,306.52, 177,068.70 and 71,717.94 is: 98,973.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,306.52 : 177,068.70 = 71,717.94 : x
  2. Step 2: Convert to fraction form
    128,306.52/177,068.70 = 71,717.94/x
  3. Step 3: Cross multiply
    128,306.52x = 177,068.70 × 71,717.94
  4. Step 4: Simplify right side
    128,306.52x = 12,699,002,402.48
  5. Step 5: Solve for x
    x = 12,699,002,402.48/128,306.52
  6. Step 6: Final answer
    x = 98,973.94

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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.