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Finding the Fourth Proportional to 927.76, 1,281.56 and 742.57

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Solution

The fourth proportional to 927.76, 1,281.56 and 742.57 is: 1,025.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.76 : 1,281.56 = 742.57 : x
  2. Step 2: Convert to fraction form
    927.76/1,281.56 = 742.57/x
  3. Step 3: Cross multiply
    927.76x = 1,281.56 × 742.57
  4. Step 4: Simplify right side
    927.76x = 951,648.01
  5. Step 5: Solve for x
    x = 951,648.01/927.76
  6. Step 6: Final answer
    x = 1,025.75

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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.