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Finding the Fourth Proportional to 91,103.70, 136,444.14 and 87,949.98

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Solution

The fourth proportional to 91,103.70, 136,444.14 and 87,949.98 is: 131,720.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,103.70 : 136,444.14 = 87,949.98 : x
  2. Step 2: Convert to fraction form
    91,103.70/136,444.14 = 87,949.98/x
  3. Step 3: Cross multiply
    91,103.70x = 136,444.14 × 87,949.98
  4. Step 4: Simplify right side
    91,103.70x = 12,000,259,384.12
  5. Step 5: Solve for x
    x = 12,000,259,384.12/91,103.70
  6. Step 6: Final answer
    x = 131,720.88

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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.