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Finding the Fourth Proportional to 438.53, 656.57 and 221.04

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Solution

The fourth proportional to 438.53, 656.57 and 221.04 is: 330.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.53 : 656.57 = 221.04 : x
  2. Step 2: Convert to fraction form
    438.53/656.57 = 221.04/x
  3. Step 3: Cross multiply
    438.53x = 656.57 × 221.04
  4. Step 4: Simplify right side
    438.53x = 145,128.79
  5. Step 5: Solve for x
    x = 145,128.79/438.53
  6. Step 6: Final answer
    x = 330.95

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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.