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Finding the Fourth Proportional to 748.28, 1,120.90 and 553.86

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Solution

The fourth proportional to 748.28, 1,120.90 and 553.86 is: 829.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.28 : 1,120.90 = 553.86 : x
  2. Step 2: Convert to fraction form
    748.28/1,120.90 = 553.86/x
  3. Step 3: Cross multiply
    748.28x = 1,120.90 × 553.86
  4. Step 4: Simplify right side
    748.28x = 620,821.67
  5. Step 5: Solve for x
    x = 620,821.67/748.28
  6. Step 6: Final answer
    x = 829.66

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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.