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Finding the Fourth Proportional to 938.56, 1,294.80 and 644.32

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Solution

The fourth proportional to 938.56, 1,294.80 and 644.32 is: 888.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.56 : 1,294.80 = 644.32 : x
  2. Step 2: Convert to fraction form
    938.56/1,294.80 = 644.32/x
  3. Step 3: Cross multiply
    938.56x = 1,294.80 × 644.32
  4. Step 4: Simplify right side
    938.56x = 834,265.54
  5. Step 5: Solve for x
    x = 834,265.54/938.56
  6. Step 6: Final answer
    x = 888.88

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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.