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Finding the Fourth Proportional to 100,673.28, 138,929.18 and 55,355.81

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Solution

The fourth proportional to 100,673.28, 138,929.18 and 55,355.81 is: 76,391.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,673.28 : 138,929.18 = 55,355.81 : x
  2. Step 2: Convert to fraction form
    100,673.28/138,929.18 = 55,355.81/x
  3. Step 3: Cross multiply
    100,673.28x = 138,929.18 × 55,355.81
  4. Step 4: Simplify right side
    100,673.28x = 7,690,536,320.11
  5. Step 5: Solve for x
    x = 7,690,536,320.11/100,673.28
  6. Step 6: Final answer
    x = 76,391.04

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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.