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Finding the Fourth Proportional to 100,572.80, 138,792.78 and 55,253.61

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Solution

The fourth proportional to 100,572.80, 138,792.78 and 55,253.61 is: 76,251.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,572.80 : 138,792.78 = 55,253.61 : x
  2. Step 2: Convert to fraction form
    100,572.80/138,792.78 = 55,253.61/x
  3. Step 3: Cross multiply
    100,572.80x = 138,792.78 × 55,253.61
  4. Step 4: Simplify right side
    100,572.80x = 7,668,802,136.94
  5. Step 5: Solve for x
    x = 7,668,802,136.94/100,572.80
  6. Step 6: Final answer
    x = 76,251.26

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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.