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Finding the Fourth Proportional to 129.03, 177.94 and 87.53

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Solution

The fourth proportional to 129.03, 177.94 and 87.53 is: 120.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.03 : 177.94 = 87.53 : x
  2. Step 2: Convert to fraction form
    129.03/177.94 = 87.53/x
  3. Step 3: Cross multiply
    129.03x = 177.94 × 87.53
  4. Step 4: Simplify right side
    129.03x = 15,575.09
  5. Step 5: Solve for x
    x = 15,575.09/129.03
  6. Step 6: Final answer
    x = 120.71

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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.