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Finding the Fourth Proportional to 748.81, 1,121.98 and 685.81

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Solution

The fourth proportional to 748.81, 1,121.98 and 685.81 is: 1,027.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.81 : 1,121.98 = 685.81 : x
  2. Step 2: Convert to fraction form
    748.81/1,121.98 = 685.81/x
  3. Step 3: Cross multiply
    748.81x = 1,121.98 × 685.81
  4. Step 4: Simplify right side
    748.81x = 769,465.10
  5. Step 5: Solve for x
    x = 769,465.10/748.81
  6. Step 6: Final answer
    x = 1,027.58

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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.