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Finding the Fourth Proportional to 642.61, 963.95 and 174.15

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Solution

The fourth proportional to 642.61, 963.95 and 174.15 is: 261.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.61 : 963.95 = 174.15 : x
  2. Step 2: Convert to fraction form
    642.61/963.95 = 174.15/x
  3. Step 3: Cross multiply
    642.61x = 963.95 × 174.15
  4. Step 4: Simplify right side
    642.61x = 167,871.89
  5. Step 5: Solve for x
    x = 167,871.89/642.61
  6. Step 6: Final answer
    x = 261.23

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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.