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Finding the Fourth Proportional to 1,919.64, 2,879.33 and 686.82

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Solution

The fourth proportional to 1,919.64, 2,879.33 and 686.82 is: 1,030.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.64 : 2,879.33 = 686.82 : x
  2. Step 2: Convert to fraction form
    1,919.64/2,879.33 = 686.82/x
  3. Step 3: Cross multiply
    1,919.64x = 2,879.33 × 686.82
  4. Step 4: Simplify right side
    1,919.64x = 1,977,578.00
  5. Step 5: Solve for x
    x = 1,977,578.00/1,919.64
  6. Step 6: Final answer
    x = 1,030.18

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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.