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Finding the Fourth Proportional to 517.30, 713.85 and 307.61

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Solution

The fourth proportional to 517.30, 713.85 and 307.61 is: 424.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.30 : 713.85 = 307.61 : x
  2. Step 2: Convert to fraction form
    517.30/713.85 = 307.61/x
  3. Step 3: Cross multiply
    517.30x = 713.85 × 307.61
  4. Step 4: Simplify right side
    517.30x = 219,585.35
  5. Step 5: Solve for x
    x = 219,585.35/517.30
  6. Step 6: Final answer
    x = 424.49

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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.