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Finding the Fourth Proportional to 100,906.29, 139,250.79 and 58,489.47

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Solution

The fourth proportional to 100,906.29, 139,250.79 and 58,489.47 is: 80,715.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,906.29 : 139,250.79 = 58,489.47 : x
  2. Step 2: Convert to fraction form
    100,906.29/139,250.79 = 58,489.47/x
  3. Step 3: Cross multiply
    100,906.29x = 139,250.79 × 58,489.47
  4. Step 4: Simplify right side
    100,906.29x = 8,144,704,904.18
  5. Step 5: Solve for x
    x = 8,144,704,904.18/100,906.29
  6. Step 6: Final answer
    x = 80,715.53

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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.