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Finding the Fourth Proportional to 1,243.91, 1,716.15 and 801.75

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Solution

The fourth proportional to 1,243.91, 1,716.15 and 801.75 is: 1,106.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.91 : 1,716.15 = 801.75 : x
  2. Step 2: Convert to fraction form
    1,243.91/1,716.15 = 801.75/x
  3. Step 3: Cross multiply
    1,243.91x = 1,716.15 × 801.75
  4. Step 4: Simplify right side
    1,243.91x = 1,375,932.70
  5. Step 5: Solve for x
    x = 1,375,932.70/1,243.91
  6. Step 6: Final answer
    x = 1,106.13

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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.