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Finding the Fourth Proportional to 130.67, 180.38 and 91.88

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Solution

The fourth proportional to 130.67, 180.38 and 91.88 is: 126.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.67 : 180.38 = 91.88 : x
  2. Step 2: Convert to fraction form
    130.67/180.38 = 91.88/x
  3. Step 3: Cross multiply
    130.67x = 180.38 × 91.88
  4. Step 4: Simplify right side
    130.67x = 16,573.31
  5. Step 5: Solve for x
    x = 16,573.31/130.67
  6. Step 6: Final answer
    x = 126.83

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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.