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Finding the Fourth Proportional to 1,136.90, 1,568.34 and 763.92

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Solution

The fourth proportional to 1,136.90, 1,568.34 and 763.92 is: 1,053.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.90 : 1,568.34 = 763.92 : x
  2. Step 2: Convert to fraction form
    1,136.90/1,568.34 = 763.92/x
  3. Step 3: Cross multiply
    1,136.90x = 1,568.34 × 763.92
  4. Step 4: Simplify right side
    1,136.90x = 1,198,086.29
  5. Step 5: Solve for x
    x = 1,198,086.29/1,136.90
  6. Step 6: Final answer
    x = 1,053.82

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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.