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Finding the Fourth Proportional to 908.45, 1,253.67 and 515.55

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Solution

The fourth proportional to 908.45, 1,253.67 and 515.55 is: 711.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.45 : 1,253.67 = 515.55 : x
  2. Step 2: Convert to fraction form
    908.45/1,253.67 = 515.55/x
  3. Step 3: Cross multiply
    908.45x = 1,253.67 × 515.55
  4. Step 4: Simplify right side
    908.45x = 646,329.57
  5. Step 5: Solve for x
    x = 646,329.57/908.45
  6. Step 6: Final answer
    x = 711.46

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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.