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Finding the Fourth Proportional to 807.27, 1,211.27 and 345.17

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Solution

The fourth proportional to 807.27, 1,211.27 and 345.17 is: 517.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.27 : 1,211.27 = 345.17 : x
  2. Step 2: Convert to fraction form
    807.27/1,211.27 = 345.17/x
  3. Step 3: Cross multiply
    807.27x = 1,211.27 × 345.17
  4. Step 4: Simplify right side
    807.27x = 418,086.28
  5. Step 5: Solve for x
    x = 418,086.28/807.27
  6. Step 6: Final answer
    x = 517.90

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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.