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Finding the Fourth Proportional to 679.55, 938.17 and 447.35

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Solution

The fourth proportional to 679.55, 938.17 and 447.35 is: 617.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.55 : 938.17 = 447.35 : x
  2. Step 2: Convert to fraction form
    679.55/938.17 = 447.35/x
  3. Step 3: Cross multiply
    679.55x = 938.17 × 447.35
  4. Step 4: Simplify right side
    679.55x = 419,693.25
  5. Step 5: Solve for x
    x = 419,693.25/679.55
  6. Step 6: Final answer
    x = 617.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.