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Finding the Fourth Proportional to 1,143.48, 1,715.57 and 681.78

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Solution

The fourth proportional to 1,143.48, 1,715.57 and 681.78 is: 1,022.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.48 : 1,715.57 = 681.78 : x
  2. Step 2: Convert to fraction form
    1,143.48/1,715.57 = 681.78/x
  3. Step 3: Cross multiply
    1,143.48x = 1,715.57 × 681.78
  4. Step 4: Simplify right side
    1,143.48x = 1,169,634.44
  5. Step 5: Solve for x
    x = 1,169,634.44/1,143.48
  6. Step 6: Final answer
    x = 1,022.88

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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.