Home / 1,919.12-2,876.36-821.16

Finding the Fourth Proportional to 1,919.12, 2,876.36 and 821.16

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Solution

The fourth proportional to 1,919.12, 2,876.36 and 821.16 is: 1,230.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.12 : 2,876.36 = 821.16 : x
  2. Step 2: Convert to fraction form
    1,919.12/2,876.36 = 821.16/x
  3. Step 3: Cross multiply
    1,919.12x = 2,876.36 × 821.16
  4. Step 4: Simplify right side
    1,919.12x = 2,361,947.67
  5. Step 5: Solve for x
    x = 2,361,947.67/1,919.12
  6. Step 6: Final answer
    x = 1,230.75

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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.