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Finding the Fourth Proportional to 747.20, 1,120.80 and 733.70

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Solution

The fourth proportional to 747.20, 1,120.80 and 733.70 is: 1,100.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.20 : 1,120.80 = 733.70 : x
  2. Step 2: Convert to fraction form
    747.20/1,120.80 = 733.70/x
  3. Step 3: Cross multiply
    747.20x = 1,120.80 × 733.70
  4. Step 4: Simplify right side
    747.20x = 822,330.96
  5. Step 5: Solve for x
    x = 822,330.96/747.20
  6. Step 6: Final answer
    x = 1,100.55

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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.