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Finding the Fourth Proportional to 220.47, 330.72 and 76.20

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Solution

The fourth proportional to 220.47, 330.72 and 76.20 is: 114.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.47 : 330.72 = 76.20 : x
  2. Step 2: Convert to fraction form
    220.47/330.72 = 76.20/x
  3. Step 3: Cross multiply
    220.47x = 330.72 × 76.20
  4. Step 4: Simplify right side
    220.47x = 25,200.86
  5. Step 5: Solve for x
    x = 25,200.86/220.47
  6. Step 6: Final answer
    x = 114.31

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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.