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Finding the Fourth Proportional to 752.67, 1,128.66 and 488.70

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Solution

The fourth proportional to 752.67, 1,128.66 and 488.70 is: 732.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.67 : 1,128.66 = 488.70 : x
  2. Step 2: Convert to fraction form
    752.67/1,128.66 = 488.70/x
  3. Step 3: Cross multiply
    752.67x = 1,128.66 × 488.70
  4. Step 4: Simplify right side
    752.67x = 551,576.14
  5. Step 5: Solve for x
    x = 551,576.14/752.67
  6. Step 6: Final answer
    x = 732.83

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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.