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Finding the Fourth Proportional to 927.72, 1,279.19 and 871.22

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Solution

The fourth proportional to 927.72, 1,279.19 and 871.22 is: 1,201.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.72 : 1,279.19 = 871.22 : x
  2. Step 2: Convert to fraction form
    927.72/1,279.19 = 871.22/x
  3. Step 3: Cross multiply
    927.72x = 1,279.19 × 871.22
  4. Step 4: Simplify right side
    927.72x = 1,114,455.91
  5. Step 5: Solve for x
    x = 1,114,455.91/927.72
  6. Step 6: Final answer
    x = 1,201.28

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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.