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Finding the Fourth Proportional to 438.72, 658.28 and 274.15

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Solution

The fourth proportional to 438.72, 658.28 and 274.15 is: 411.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.72 : 658.28 = 274.15 : x
  2. Step 2: Convert to fraction form
    438.72/658.28 = 274.15/x
  3. Step 3: Cross multiply
    438.72x = 658.28 × 274.15
  4. Step 4: Simplify right side
    438.72x = 180,467.46
  5. Step 5: Solve for x
    x = 180,467.46/438.72
  6. Step 6: Final answer
    x = 411.35

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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.