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Finding the Fourth Proportional to 908.52, 1,253.78 and 515.60

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Solution

The fourth proportional to 908.52, 1,253.78 and 515.60 is: 711.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.52 : 1,253.78 = 515.60 : x
  2. Step 2: Convert to fraction form
    908.52/1,253.78 = 515.60/x
  3. Step 3: Cross multiply
    908.52x = 1,253.78 × 515.60
  4. Step 4: Simplify right side
    908.52x = 646,448.97
  5. Step 5: Solve for x
    x = 646,448.97/908.52
  6. Step 6: Final answer
    x = 711.54

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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.