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Finding the Fourth Proportional to 927.70, 1,388.82 and 685.31

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Solution

The fourth proportional to 927.70, 1,388.82 and 685.31 is: 1,025.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.70 : 1,388.82 = 685.31 : x
  2. Step 2: Convert to fraction form
    927.70/1,388.82 = 685.31/x
  3. Step 3: Cross multiply
    927.70x = 1,388.82 × 685.31
  4. Step 4: Simplify right side
    927.70x = 951,765.34
  5. Step 5: Solve for x
    x = 951,765.34/927.70
  6. Step 6: Final answer
    x = 1,025.94

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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.