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Finding the Fourth Proportional to 642.85, 963.25 and 382.23

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Solution

The fourth proportional to 642.85, 963.25 and 382.23 is: 572.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.85 : 963.25 = 382.23 : x
  2. Step 2: Convert to fraction form
    642.85/963.25 = 382.23/x
  3. Step 3: Cross multiply
    642.85x = 963.25 × 382.23
  4. Step 4: Simplify right side
    642.85x = 368,185.46
  5. Step 5: Solve for x
    x = 368,185.46/642.85
  6. Step 6: Final answer
    x = 572.74

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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.