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Finding the Fourth Proportional to 125,612.68, 188,399.40 and 81,551.92

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Solution

The fourth proportional to 125,612.68, 188,399.40 and 81,551.92 is: 122,315.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,612.68 : 188,399.40 = 81,551.92 : x
  2. Step 2: Convert to fraction form
    125,612.68/188,399.40 = 81,551.92/x
  3. Step 3: Cross multiply
    125,612.68x = 188,399.40 × 81,551.92
  4. Step 4: Simplify right side
    125,612.68x = 15,364,332,796.85
  5. Step 5: Solve for x
    x = 15,364,332,796.85/125,612.68
  6. Step 6: Final answer
    x = 122,315.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.