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Finding the Fourth Proportional to 908.10, 1,251.72 and 711.27

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Solution

The fourth proportional to 908.10, 1,251.72 and 711.27 is: 980.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.10 : 1,251.72 = 711.27 : x
  2. Step 2: Convert to fraction form
    908.10/1,251.72 = 711.27/x
  3. Step 3: Cross multiply
    908.10x = 1,251.72 × 711.27
  4. Step 4: Simplify right side
    908.10x = 890,310.88
  5. Step 5: Solve for x
    x = 890,310.88/908.10
  6. Step 6: Final answer
    x = 980.41

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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.