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Finding the Fourth Proportional to 642.60, 963.90 and 498.42

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Solution

The fourth proportional to 642.60, 963.90 and 498.42 is: 747.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.60 : 963.90 = 498.42 : x
  2. Step 2: Convert to fraction form
    642.60/963.90 = 498.42/x
  3. Step 3: Cross multiply
    642.60x = 963.90 × 498.42
  4. Step 4: Simplify right side
    642.60x = 480,427.04
  5. Step 5: Solve for x
    x = 480,427.04/642.60
  6. Step 6: Final answer
    x = 747.63

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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.