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Finding the Fourth Proportional to 908.56, 1,253.68 and 515.62

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Solution

The fourth proportional to 908.56, 1,253.68 and 515.62 is: 711.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.56 : 1,253.68 = 515.62 : x
  2. Step 2: Convert to fraction form
    908.56/1,253.68 = 515.62/x
  3. Step 3: Cross multiply
    908.56x = 1,253.68 × 515.62
  4. Step 4: Simplify right side
    908.56x = 646,422.48
  5. Step 5: Solve for x
    x = 646,422.48/908.56
  6. Step 6: Final answer
    x = 711.48

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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.