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Finding the Fourth Proportional to 1,266.39, 1,747.77 and 769.20

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Solution

The fourth proportional to 1,266.39, 1,747.77 and 769.20 is: 1,061.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.39 : 1,747.77 = 769.20 : x
  2. Step 2: Convert to fraction form
    1,266.39/1,747.77 = 769.20/x
  3. Step 3: Cross multiply
    1,266.39x = 1,747.77 × 769.20
  4. Step 4: Simplify right side
    1,266.39x = 1,344,384.68
  5. Step 5: Solve for x
    x = 1,344,384.68/1,266.39
  6. Step 6: Final answer
    x = 1,061.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.