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Finding the Fourth Proportional to 1,122.69, 1,549.62 and 680.85

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Solution

The fourth proportional to 1,122.69, 1,549.62 and 680.85 is: 939.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.69 : 1,549.62 = 680.85 : x
  2. Step 2: Convert to fraction form
    1,122.69/1,549.62 = 680.85/x
  3. Step 3: Cross multiply
    1,122.69x = 1,549.62 × 680.85
  4. Step 4: Simplify right side
    1,122.69x = 1,055,058.78
  5. Step 5: Solve for x
    x = 1,055,058.78/1,122.69
  6. Step 6: Final answer
    x = 939.76

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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.