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Finding the Fourth Proportional to 638.49, 963.48 and 615.60

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Solution

The fourth proportional to 638.49, 963.48 and 615.60 is: 928.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.49 : 963.48 = 615.60 : x
  2. Step 2: Convert to fraction form
    638.49/963.48 = 615.60/x
  3. Step 3: Cross multiply
    638.49x = 963.48 × 615.60
  4. Step 4: Simplify right side
    638.49x = 593,118.29
  5. Step 5: Solve for x
    x = 593,118.29/638.49
  6. Step 6: Final answer
    x = 928.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.