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Finding the Fourth Proportional to 130.38, 179.92 and 72.16

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Solution

The fourth proportional to 130.38, 179.92 and 72.16 is: 99.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.38 : 179.92 = 72.16 : x
  2. Step 2: Convert to fraction form
    130.38/179.92 = 72.16/x
  3. Step 3: Cross multiply
    130.38x = 179.92 × 72.16
  4. Step 4: Simplify right side
    130.38x = 12,983.03
  5. Step 5: Solve for x
    x = 12,983.03/130.38
  6. Step 6: Final answer
    x = 99.58

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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.