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Finding the Fourth Proportional to 129.74, 177.77 and 128.54

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Solution

The fourth proportional to 129.74, 177.77 and 128.54 is: 176.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.74 : 177.77 = 128.54 : x
  2. Step 2: Convert to fraction form
    129.74/177.77 = 128.54/x
  3. Step 3: Cross multiply
    129.74x = 177.77 × 128.54
  4. Step 4: Simplify right side
    129.74x = 22,849.02
  5. Step 5: Solve for x
    x = 22,849.02/129.74
  6. Step 6: Final answer
    x = 176.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.