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Finding the Fourth Proportional to 905.85, 1,248.39 and 739.53

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Solution

The fourth proportional to 905.85, 1,248.39 and 739.53 is: 1,019.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.85 : 1,248.39 = 739.53 : x
  2. Step 2: Convert to fraction form
    905.85/1,248.39 = 739.53/x
  3. Step 3: Cross multiply
    905.85x = 1,248.39 × 739.53
  4. Step 4: Simplify right side
    905.85x = 923,221.86
  5. Step 5: Solve for x
    x = 923,221.86/905.85
  6. Step 6: Final answer
    x = 1,019.18

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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.