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Finding the Fourth Proportional to 517.91, 714.70 and 308.18

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Solution

The fourth proportional to 517.91, 714.70 and 308.18 is: 425.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.91 : 714.70 = 308.18 : x
  2. Step 2: Convert to fraction form
    517.91/714.70 = 308.18/x
  3. Step 3: Cross multiply
    517.91x = 714.70 × 308.18
  4. Step 4: Simplify right side
    517.91x = 220,258.42
  5. Step 5: Solve for x
    x = 220,258.42/517.91
  6. Step 6: Final answer
    x = 425.29

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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.