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Finding the Fourth Proportional to 756.62, 1,129.44 and 722.91

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Solution

The fourth proportional to 756.62, 1,129.44 and 722.91 is: 1,079.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.62 : 1,129.44 = 722.91 : x
  2. Step 2: Convert to fraction form
    756.62/1,129.44 = 722.91/x
  3. Step 3: Cross multiply
    756.62x = 1,129.44 × 722.91
  4. Step 4: Simplify right side
    756.62x = 816,483.47
  5. Step 5: Solve for x
    x = 816,483.47/756.62
  6. Step 6: Final answer
    x = 1,079.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.