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Finding the Fourth Proportional to 131.18, 180.19 and 129.38

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Solution

The fourth proportional to 131.18, 180.19 and 129.38 is: 177.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.18 : 180.19 = 129.38 : x
  2. Step 2: Convert to fraction form
    131.18/180.19 = 129.38/x
  3. Step 3: Cross multiply
    131.18x = 180.19 × 129.38
  4. Step 4: Simplify right side
    131.18x = 23,312.98
  5. Step 5: Solve for x
    x = 23,312.98/131.18
  6. Step 6: Final answer
    x = 177.72

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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.