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Finding the Fourth Proportional to 1,376.90, 2,067.17 and 719.28

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Solution

The fourth proportional to 1,376.90, 2,067.17 and 719.28 is: 1,079.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.90 : 2,067.17 = 719.28 : x
  2. Step 2: Convert to fraction form
    1,376.90/2,067.17 = 719.28/x
  3. Step 3: Cross multiply
    1,376.90x = 2,067.17 × 719.28
  4. Step 4: Simplify right side
    1,376.90x = 1,486,874.49
  5. Step 5: Solve for x
    x = 1,486,874.49/1,376.90
  6. Step 6: Final answer
    x = 1,079.87

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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.