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Finding the Fourth Proportional to 1,180.70, 1,767.20 and 814.38

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Solution

The fourth proportional to 1,180.70, 1,767.20 and 814.38 is: 1,218.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.70 : 1,767.20 = 814.38 : x
  2. Step 2: Convert to fraction form
    1,180.70/1,767.20 = 814.38/x
  3. Step 3: Cross multiply
    1,180.70x = 1,767.20 × 814.38
  4. Step 4: Simplify right side
    1,180.70x = 1,439,172.34
  5. Step 5: Solve for x
    x = 1,439,172.34/1,180.70
  6. Step 6: Final answer
    x = 1,218.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.