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Finding the Fourth Proportional to 130.38, 179.79 and 112.88

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Solution

The fourth proportional to 130.38, 179.79 and 112.88 is: 155.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.38 : 179.79 = 112.88 : x
  2. Step 2: Convert to fraction form
    130.38/179.79 = 112.88/x
  3. Step 3: Cross multiply
    130.38x = 179.79 × 112.88
  4. Step 4: Simplify right side
    130.38x = 20,294.72
  5. Step 5: Solve for x
    x = 20,294.72/130.38
  6. Step 6: Final answer
    x = 155.66

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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.