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Finding the Fourth Proportional to 129,616.72, 178,915.80 and 75,919.04

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Solution

The fourth proportional to 129,616.72, 178,915.80 and 75,919.04 is: 104,794.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,616.72 : 178,915.80 = 75,919.04 : x
  2. Step 2: Convert to fraction form
    129,616.72/178,915.80 = 75,919.04/x
  3. Step 3: Cross multiply
    129,616.72x = 178,915.80 × 75,919.04
  4. Step 4: Simplify right side
    129,616.72x = 13,583,115,776.83
  5. Step 5: Solve for x
    x = 13,583,115,776.83/129,616.72
  6. Step 6: Final answer
    x = 104,794.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.