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Finding the Fourth Proportional to 126,778.70, 189,887.75 and 86,702.72

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Solution

The fourth proportional to 126,778.70, 189,887.75 and 86,702.72 is: 129,862.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,778.70 : 189,887.75 = 86,702.72 : x
  2. Step 2: Convert to fraction form
    126,778.70/189,887.75 = 86,702.72/x
  3. Step 3: Cross multiply
    126,778.70x = 189,887.75 × 86,702.72
  4. Step 4: Simplify right side
    126,778.70x = 16,463,783,036.73
  5. Step 5: Solve for x
    x = 16,463,783,036.73/126,778.70
  6. Step 6: Final answer
    x = 129,862.38

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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.