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Finding the Fourth Proportional to 181.50, 250.55 and 129.15

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Solution

The fourth proportional to 181.50, 250.55 and 129.15 is: 178.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.50 : 250.55 = 129.15 : x
  2. Step 2: Convert to fraction form
    181.50/250.55 = 129.15/x
  3. Step 3: Cross multiply
    181.50x = 250.55 × 129.15
  4. Step 4: Simplify right side
    181.50x = 32,358.53
  5. Step 5: Solve for x
    x = 32,358.53/181.50
  6. Step 6: Final answer
    x = 178.28

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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.