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Finding the Fourth Proportional to 1,136.69, 1,568.39 and 688.43

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Solution

The fourth proportional to 1,136.69, 1,568.39 and 688.43 is: 949.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.69 : 1,568.39 = 688.43 : x
  2. Step 2: Convert to fraction form
    1,136.69/1,568.39 = 688.43/x
  3. Step 3: Cross multiply
    1,136.69x = 1,568.39 × 688.43
  4. Step 4: Simplify right side
    1,136.69x = 1,079,715.44
  5. Step 5: Solve for x
    x = 1,079,715.44/1,136.69
  6. Step 6: Final answer
    x = 949.88

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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.