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Finding the Fourth Proportional to 119.76, 179.28 and 81.24

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Solution

The fourth proportional to 119.76, 179.28 and 81.24 is: 121.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.76 : 179.28 = 81.24 : x
  2. Step 2: Convert to fraction form
    119.76/179.28 = 81.24/x
  3. Step 3: Cross multiply
    119.76x = 179.28 × 81.24
  4. Step 4: Simplify right side
    119.76x = 14,564.71
  5. Step 5: Solve for x
    x = 14,564.71/119.76
  6. Step 6: Final answer
    x = 121.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.