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Finding the Fourth Proportional to 129.68, 177.40 and 129.32

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Solution

The fourth proportional to 129.68, 177.40 and 129.32 is: 176.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.68 : 177.40 = 129.32 : x
  2. Step 2: Convert to fraction form
    129.68/177.40 = 129.32/x
  3. Step 3: Cross multiply
    129.68x = 177.40 × 129.32
  4. Step 4: Simplify right side
    129.68x = 22,941.37
  5. Step 5: Solve for x
    x = 22,941.37/129.68
  6. Step 6: Final answer
    x = 176.91

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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.