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Finding the Fourth Proportional to 679.41, 1,016.92 and 615.47

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Solution

The fourth proportional to 679.41, 1,016.92 and 615.47 is: 921.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.41 : 1,016.92 = 615.47 : x
  2. Step 2: Convert to fraction form
    679.41/1,016.92 = 615.47/x
  3. Step 3: Cross multiply
    679.41x = 1,016.92 × 615.47
  4. Step 4: Simplify right side
    679.41x = 625,883.75
  5. Step 5: Solve for x
    x = 625,883.75/679.41
  6. Step 6: Final answer
    x = 921.22

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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.