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Finding the Fourth Proportional to 908.09, 1,253.17 and 515.11

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Solution

The fourth proportional to 908.09, 1,253.17 and 515.11 is: 710.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.09 : 1,253.17 = 515.11 : x
  2. Step 2: Convert to fraction form
    908.09/1,253.17 = 515.11/x
  3. Step 3: Cross multiply
    908.09x = 1,253.17 × 515.11
  4. Step 4: Simplify right side
    908.09x = 645,520.26
  5. Step 5: Solve for x
    x = 645,520.26/908.09
  6. Step 6: Final answer
    x = 710.86

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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.