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Finding the Fourth Proportional to 515.27, 711.11 and 291.13

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Solution

The fourth proportional to 515.27, 711.11 and 291.13 is: 401.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.27 : 711.11 = 291.13 : x
  2. Step 2: Convert to fraction form
    515.27/711.11 = 291.13/x
  3. Step 3: Cross multiply
    515.27x = 711.11 × 291.13
  4. Step 4: Simplify right side
    515.27x = 207,023.44
  5. Step 5: Solve for x
    x = 207,023.44/515.27
  6. Step 6: Final answer
    x = 401.78

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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.