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Finding the Fourth Proportional to 345.15, 517.43 and 308.70

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Solution

The fourth proportional to 345.15, 517.43 and 308.70 is: 462.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.15 : 517.43 = 308.70 : x
  2. Step 2: Convert to fraction form
    345.15/517.43 = 308.70/x
  3. Step 3: Cross multiply
    345.15x = 517.43 × 308.70
  4. Step 4: Simplify right side
    345.15x = 159,729.10
  5. Step 5: Solve for x
    x = 159,729.10/345.15
  6. Step 6: Final answer
    x = 462.78

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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.