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Finding the Fourth Proportional to 138,702.20, 191,408.76 and 75,040.04

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Solution

The fourth proportional to 138,702.20, 191,408.76 and 75,040.04 is: 103,555.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,702.20 : 191,408.76 = 75,040.04 : x
  2. Step 2: Convert to fraction form
    138,702.20/191,408.76 = 75,040.04/x
  3. Step 3: Cross multiply
    138,702.20x = 191,408.76 × 75,040.04
  4. Step 4: Simplify right side
    138,702.20x = 14,363,321,006.75
  5. Step 5: Solve for x
    x = 14,363,321,006.75/138,702.20
  6. Step 6: Final answer
    x = 103,555.11

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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.