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Finding the Fourth Proportional to 1,136.70, 1,568.39 and 717.21

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Solution

The fourth proportional to 1,136.70, 1,568.39 and 717.21 is: 989.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.70 : 1,568.39 = 717.21 : x
  2. Step 2: Convert to fraction form
    1,136.70/1,568.39 = 717.21/x
  3. Step 3: Cross multiply
    1,136.70x = 1,568.39 × 717.21
  4. Step 4: Simplify right side
    1,136.70x = 1,124,861.41
  5. Step 5: Solve for x
    x = 1,124,861.41/1,136.70
  6. Step 6: Final answer
    x = 989.59

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1.5x scale

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.