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Finding the Fourth Proportional to 1,182, 1,631.64 and 769.20

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Solution

The fourth proportional to 1,182, 1,631.64 and 769.20 is: 1,061.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,182 : 1,631.64 = 769.20 : x
  2. Step 2: Convert to fraction form
    1,182/1,631.64 = 769.20/x
  3. Step 3: Cross multiply
    1,182x = 1,631.64 × 769.20
  4. Step 4: Simplify right side
    1,182x = 1,255,057.49
  5. Step 5: Solve for x
    x = 1,255,057.49/1,182
  6. Step 6: Final answer
    x = 1,061.81

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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.