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Finding the Fourth Proportional to 642.12, 963.20 and 252.10

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Solution

The fourth proportional to 642.12, 963.20 and 252.10 is: 378.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.12 : 963.20 = 252.10 : x
  2. Step 2: Convert to fraction form
    642.12/963.20 = 252.10/x
  3. Step 3: Cross multiply
    642.12x = 963.20 × 252.10
  4. Step 4: Simplify right side
    642.12x = 242,822.72
  5. Step 5: Solve for x
    x = 242,822.72/642.12
  6. Step 6: Final answer
    x = 378.16

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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.