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Finding the Fourth Proportional to 119.70, 179.28 and 85.28

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Solution

The fourth proportional to 119.70, 179.28 and 85.28 is: 127.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.70 : 179.28 = 85.28 : x
  2. Step 2: Convert to fraction form
    119.70/179.28 = 85.28/x
  3. Step 3: Cross multiply
    119.70x = 179.28 × 85.28
  4. Step 4: Simplify right side
    119.70x = 15,287.68
  5. Step 5: Solve for x
    x = 15,287.68/119.70
  6. Step 6: Final answer
    x = 127.72

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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.