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Finding the Fourth Proportional to 129,694.40, 194,234.40 and 87,915.20

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Solution

The fourth proportional to 129,694.40, 194,234.40 and 87,915.20 is: 131,664.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,694.40 : 194,234.40 = 87,915.20 : x
  2. Step 2: Convert to fraction form
    129,694.40/194,234.40 = 87,915.20/x
  3. Step 3: Cross multiply
    129,694.40x = 194,234.40 × 87,915.20
  4. Step 4: Simplify right side
    129,694.40x = 17,076,156,122.88
  5. Step 5: Solve for x
    x = 17,076,156,122.88/129,694.40
  6. Step 6: Final answer
    x = 131,664.56

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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.