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Finding the Fourth Proportional to 748.31, 1,033.16 and 685.89

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Solution

The fourth proportional to 748.31, 1,033.16 and 685.89 is: 946.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.31 : 1,033.16 = 685.89 : x
  2. Step 2: Convert to fraction form
    748.31/1,033.16 = 685.89/x
  3. Step 3: Cross multiply
    748.31x = 1,033.16 × 685.89
  4. Step 4: Simplify right side
    748.31x = 708,630.68
  5. Step 5: Solve for x
    x = 708,630.68/748.31
  6. Step 6: Final answer
    x = 946.98

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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.