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Finding the Fourth Proportional to 220.48, 330.78 and 76.24

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Solution

The fourth proportional to 220.48, 330.78 and 76.24 is: 114.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.48 : 330.78 = 76.24 : x
  2. Step 2: Convert to fraction form
    220.48/330.78 = 76.24/x
  3. Step 3: Cross multiply
    220.48x = 330.78 × 76.24
  4. Step 4: Simplify right side
    220.48x = 25,218.67
  5. Step 5: Solve for x
    x = 25,218.67/220.48
  6. Step 6: Final answer
    x = 114.38

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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.