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Finding the Fourth Proportional to 1,862.28, 2,791.26 and 691.86

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Solution

The fourth proportional to 1,862.28, 2,791.26 and 691.86 is: 1,036.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,862.28 : 2,791.26 = 691.86 : x
  2. Step 2: Convert to fraction form
    1,862.28/2,791.26 = 691.86/x
  3. Step 3: Cross multiply
    1,862.28x = 2,791.26 × 691.86
  4. Step 4: Simplify right side
    1,862.28x = 1,931,161.14
  5. Step 5: Solve for x
    x = 1,931,161.14/1,862.28
  6. Step 6: Final answer
    x = 1,036.99

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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.