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Finding the Fourth Proportional to 515.35, 711.17 and 282.47

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Solution

The fourth proportional to 515.35, 711.17 and 282.47 is: 389.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.35 : 711.17 = 282.47 : x
  2. Step 2: Convert to fraction form
    515.35/711.17 = 282.47/x
  3. Step 3: Cross multiply
    515.35x = 711.17 × 282.47
  4. Step 4: Simplify right side
    515.35x = 200,886.67
  5. Step 5: Solve for x
    x = 200,886.67/515.35
  6. Step 6: Final answer
    x = 389.81

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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.