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Finding the Fourth Proportional to 515.29, 711.19 and 391.36

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Solution

The fourth proportional to 515.29, 711.19 and 391.36 is: 540.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.29 : 711.19 = 391.36 : x
  2. Step 2: Convert to fraction form
    515.29/711.19 = 391.36/x
  3. Step 3: Cross multiply
    515.29x = 711.19 × 391.36
  4. Step 4: Simplify right side
    515.29x = 278,330.26
  5. Step 5: Solve for x
    x = 278,330.26/515.29
  6. Step 6: Final answer
    x = 540.14

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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.