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Finding the Fourth Proportional to 912.20, 1,371.33 and 844.56

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Solution

The fourth proportional to 912.20, 1,371.33 and 844.56 is: 1,269.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.20 : 1,371.33 = 844.56 : x
  2. Step 2: Convert to fraction form
    912.20/1,371.33 = 844.56/x
  3. Step 3: Cross multiply
    912.20x = 1,371.33 × 844.56
  4. Step 4: Simplify right side
    912.20x = 1,158,170.46
  5. Step 5: Solve for x
    x = 1,158,170.46/912.20
  6. Step 6: Final answer
    x = 1,269.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.