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Finding the Fourth Proportional to 100,965.17, 139,332.89 and 55,644.79

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Solution

The fourth proportional to 100,965.17, 139,332.89 and 55,644.79 is: 76,790.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,965.17 : 139,332.89 = 55,644.79 : x
  2. Step 2: Convert to fraction form
    100,965.17/139,332.89 = 55,644.79/x
  3. Step 3: Cross multiply
    100,965.17x = 139,332.89 × 55,644.79
  4. Step 4: Simplify right side
    100,965.17x = 7,753,149,404.14
  5. Step 5: Solve for x
    x = 7,753,149,404.14/100,965.17
  6. Step 6: Final answer
    x = 76,790.34

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1.5x scale

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.