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Finding the Fourth Proportional to 126,805.28, 189,927.56 and 86,729.28

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Solution

The fourth proportional to 126,805.28, 189,927.56 and 86,729.28 is: 129,902.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,805.28 : 189,927.56 = 86,729.28 : x
  2. Step 2: Convert to fraction form
    126,805.28/189,927.56 = 86,729.28/x
  3. Step 3: Cross multiply
    126,805.28x = 189,927.56 × 86,729.28
  4. Step 4: Simplify right side
    126,805.28x = 16,472,280,530.96
  5. Step 5: Solve for x
    x = 16,472,280,530.96/126,805.28
  6. Step 6: Final answer
    x = 129,902.17

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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.