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Finding the Fourth Proportional to 869.11, 1,302.13 and 722

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Solution

The fourth proportional to 869.11, 1,302.13 and 722 is: 1,081.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.11 : 1,302.13 = 722 : x
  2. Step 2: Convert to fraction form
    869.11/1,302.13 = 722/x
  3. Step 3: Cross multiply
    869.11x = 1,302.13 × 722
  4. Step 4: Simplify right side
    869.11x = 940,136.06
  5. Step 5: Solve for x
    x = 940,136.06/869.11
  6. Step 6: Final answer
    x = 1,081.72

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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.