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Finding the Fourth Proportional to 1,920.14, 2,879.18 and 686.88

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Solution

The fourth proportional to 1,920.14, 2,879.18 and 686.88 is: 1,029.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.14 : 2,879.18 = 686.88 : x
  2. Step 2: Convert to fraction form
    1,920.14/2,879.18 = 686.88/x
  3. Step 3: Cross multiply
    1,920.14x = 2,879.18 × 686.88
  4. Step 4: Simplify right side
    1,920.14x = 1,977,635.05
  5. Step 5: Solve for x
    x = 1,977,635.05/1,920.14
  6. Step 6: Final answer
    x = 1,029.95

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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.