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Finding the Fourth Proportional to 1,122.84, 1,549.67 and 769.13

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Solution

The fourth proportional to 1,122.84, 1,549.67 and 769.13 is: 1,061.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.84 : 1,549.67 = 769.13 : x
  2. Step 2: Convert to fraction form
    1,122.84/1,549.67 = 769.13/x
  3. Step 3: Cross multiply
    1,122.84x = 1,549.67 × 769.13
  4. Step 4: Simplify right side
    1,122.84x = 1,191,891.90
  5. Step 5: Solve for x
    x = 1,191,891.90/1,122.84
  6. Step 6: Final answer
    x = 1,061.50

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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.