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Finding the Fourth Proportional to 515.29, 711.07 and 282.42

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Solution

The fourth proportional to 515.29, 711.07 and 282.42 is: 389.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.29 : 711.07 = 282.42 : x
  2. Step 2: Convert to fraction form
    515.29/711.07 = 282.42/x
  3. Step 3: Cross multiply
    515.29x = 711.07 × 282.42
  4. Step 4: Simplify right side
    515.29x = 200,820.39
  5. Step 5: Solve for x
    x = 200,820.39/515.29
  6. Step 6: Final answer
    x = 389.72

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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.