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Finding the Fourth Proportional to 89,908.80, 134,863.20 and 61,915.20

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Solution

The fourth proportional to 89,908.80, 134,863.20 and 61,915.20 is: 92,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,908.80 : 134,863.20 = 61,915.20 : x
  2. Step 2: Convert to fraction form
    89,908.80/134,863.20 = 61,915.20/x
  3. Step 3: Cross multiply
    89,908.80x = 134,863.20 × 61,915.20
  4. Step 4: Simplify right side
    89,908.80x = 8,350,082,000.64
  5. Step 5: Solve for x
    x = 8,350,082,000.64/89,908.80
  6. Step 6: Final answer
    x = 92,872.80

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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.