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Finding the Fourth Proportional to 515.38, 711.22 and 282.50

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Solution

The fourth proportional to 515.38, 711.22 and 282.50 is: 389.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.38 : 711.22 = 282.50 : x
  2. Step 2: Convert to fraction form
    515.38/711.22 = 282.50/x
  3. Step 3: Cross multiply
    515.38x = 711.22 × 282.50
  4. Step 4: Simplify right side
    515.38x = 200,919.65
  5. Step 5: Solve for x
    x = 200,919.65/515.38
  6. Step 6: Final answer
    x = 389.85

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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.