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Finding the Fourth Proportional to 1,142.30, 1,576.04 and 769.70

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Solution

The fourth proportional to 1,142.30, 1,576.04 and 769.70 is: 1,061.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.30 : 1,576.04 = 769.70 : x
  2. Step 2: Convert to fraction form
    1,142.30/1,576.04 = 769.70/x
  3. Step 3: Cross multiply
    1,142.30x = 1,576.04 × 769.70
  4. Step 4: Simplify right side
    1,142.30x = 1,213,066.26
  5. Step 5: Solve for x
    x = 1,213,066.26/1,142.30
  6. Step 6: Final answer
    x = 1,061.96

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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.