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Finding the Fourth Proportional to 91,381.10, 137,071.65 and 87,881.90

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Solution

The fourth proportional to 91,381.10, 137,071.65 and 87,881.90 is: 131,822.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,381.10 : 137,071.65 = 87,881.90 : x
  2. Step 2: Convert to fraction form
    91,381.10/137,071.65 = 87,881.90/x
  3. Step 3: Cross multiply
    91,381.10x = 137,071.65 × 87,881.90
  4. Step 4: Simplify right side
    91,381.10x = 12,046,117,038.14
  5. Step 5: Solve for x
    x = 12,046,117,038.14/91,381.10
  6. Step 6: Final answer
    x = 131,822.85

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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.