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Finding the Fourth Proportional to 1,255.27, 1,732.17 and 813.01

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Solution

The fourth proportional to 1,255.27, 1,732.17 and 813.01 is: 1,121.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.27 : 1,732.17 = 813.01 : x
  2. Step 2: Convert to fraction form
    1,255.27/1,732.17 = 813.01/x
  3. Step 3: Cross multiply
    1,255.27x = 1,732.17 × 813.01
  4. Step 4: Simplify right side
    1,255.27x = 1,408,271.53
  5. Step 5: Solve for x
    x = 1,408,271.53/1,255.27
  6. Step 6: Final answer
    x = 1,121.89

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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.