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Finding the Fourth Proportional to 220.68, 330.93 and 90.72

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Solution

The fourth proportional to 220.68, 330.93 and 90.72 is: 136.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.68 : 330.93 = 90.72 : x
  2. Step 2: Convert to fraction form
    220.68/330.93 = 90.72/x
  3. Step 3: Cross multiply
    220.68x = 330.93 × 90.72
  4. Step 4: Simplify right side
    220.68x = 30,021.97
  5. Step 5: Solve for x
    x = 30,021.97/220.68
  6. Step 6: Final answer
    x = 136.04

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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.