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Finding the Fourth Proportional to 642.12, 962.72 and 271.95

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Solution

The fourth proportional to 642.12, 962.72 and 271.95 is: 407.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.12 : 962.72 = 271.95 : x
  2. Step 2: Convert to fraction form
    642.12/962.72 = 271.95/x
  3. Step 3: Cross multiply
    642.12x = 962.72 × 271.95
  4. Step 4: Simplify right side
    642.12x = 261,811.70
  5. Step 5: Solve for x
    x = 261,811.70/642.12
  6. Step 6: Final answer
    x = 407.73

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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.