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Finding the Fourth Proportional to 220.48, 330.75 and 98.78

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Solution

The fourth proportional to 220.48, 330.75 and 98.78 is: 148.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.48 : 330.75 = 98.78 : x
  2. Step 2: Convert to fraction form
    220.48/330.75 = 98.78/x
  3. Step 3: Cross multiply
    220.48x = 330.75 × 98.78
  4. Step 4: Simplify right side
    220.48x = 32,669.83
  5. Step 5: Solve for x
    x = 32,669.83/220.48
  6. Step 6: Final answer
    x = 148.18

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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.