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Finding the Fourth Proportional to 91,381.20, 136,962.72 and 47,029.20

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Solution

The fourth proportional to 91,381.20, 136,962.72 and 47,029.20 is: 70,487.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,381.20 : 136,962.72 = 47,029.20 : x
  2. Step 2: Convert to fraction form
    91,381.20/136,962.72 = 47,029.20/x
  3. Step 3: Cross multiply
    91,381.20x = 136,962.72 × 47,029.20
  4. Step 4: Simplify right side
    91,381.20x = 6,441,247,151.42
  5. Step 5: Solve for x
    x = 6,441,247,151.42/91,381.20
  6. Step 6: Final answer
    x = 70,487.66

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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.