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Finding the Fourth Proportional to 642.48, 963.76 and 574.48

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Solution

The fourth proportional to 642.48, 963.76 and 574.48 is: 861.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.48 : 963.76 = 574.48 : x
  2. Step 2: Convert to fraction form
    642.48/963.76 = 574.48/x
  3. Step 3: Cross multiply
    642.48x = 963.76 × 574.48
  4. Step 4: Simplify right side
    642.48x = 553,660.84
  5. Step 5: Solve for x
    x = 553,660.84/642.48
  6. Step 6: Final answer
    x = 861.76

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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.