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Finding the Fourth Proportional to 908.38, 1,253.49 and 515.50

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Solution

The fourth proportional to 908.38, 1,253.49 and 515.50 is: 711.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.38 : 1,253.49 = 515.50 : x
  2. Step 2: Convert to fraction form
    908.38/1,253.49 = 515.50/x
  3. Step 3: Cross multiply
    908.38x = 1,253.49 × 515.50
  4. Step 4: Simplify right side
    908.38x = 646,174.10
  5. Step 5: Solve for x
    x = 646,174.10/908.38
  6. Step 6: Final answer
    x = 711.35

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1.5x scale

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.