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Finding the Fourth Proportional to 756.29, 1,136.16 and 725.15

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Solution

The fourth proportional to 756.29, 1,136.16 and 725.15 is: 1,089.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.29 : 1,136.16 = 725.15 : x
  2. Step 2: Convert to fraction form
    756.29/1,136.16 = 725.15/x
  3. Step 3: Cross multiply
    756.29x = 1,136.16 × 725.15
  4. Step 4: Simplify right side
    756.29x = 823,880.74
  5. Step 5: Solve for x
    x = 823,880.74/756.29
  6. Step 6: Final answer
    x = 1,089.38

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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.