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Finding the Fourth Proportional to 908.57, 1,253.86 and 515.57

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Solution

The fourth proportional to 908.57, 1,253.86 and 515.57 is: 711.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.57 : 1,253.86 = 515.57 : x
  2. Step 2: Convert to fraction form
    908.57/1,253.86 = 515.57/x
  3. Step 3: Cross multiply
    908.57x = 1,253.86 × 515.57
  4. Step 4: Simplify right side
    908.57x = 646,445.04
  5. Step 5: Solve for x
    x = 646,445.04/908.57
  6. Step 6: Final answer
    x = 711.50

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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.