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Finding the Fourth Proportional to 757.77, 1,138.80 and 449.69

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Solution

The fourth proportional to 757.77, 1,138.80 and 449.69 is: 675.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.77 : 1,138.80 = 449.69 : x
  2. Step 2: Convert to fraction form
    757.77/1,138.80 = 449.69/x
  3. Step 3: Cross multiply
    757.77x = 1,138.80 × 449.69
  4. Step 4: Simplify right side
    757.77x = 512,101.28
  5. Step 5: Solve for x
    x = 512,101.28/757.77
  6. Step 6: Final answer
    x = 675.80

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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.