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Finding the Fourth Proportional to 136,421.52, 188,236.71 and 75,990.66

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Solution

The fourth proportional to 136,421.52, 188,236.71 and 75,990.66 is: 104,853.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,421.52 : 188,236.71 = 75,990.66 : x
  2. Step 2: Convert to fraction form
    136,421.52/188,236.71 = 75,990.66/x
  3. Step 3: Cross multiply
    136,421.52x = 188,236.71 × 75,990.66
  4. Step 4: Simplify right side
    136,421.52x = 14,304,231,123.24
  5. Step 5: Solve for x
    x = 14,304,231,123.24/136,421.52
  6. Step 6: Final answer
    x = 104,853.19

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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.