Home / 2,121.76-2,928.15-1,282.45

Finding the Fourth Proportional to 2,121.76, 2,928.15 and 1,282.45

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Solution

The fourth proportional to 2,121.76, 2,928.15 and 1,282.45 is: 1,769.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.76 : 2,928.15 = 1,282.45 : x
  2. Step 2: Convert to fraction form
    2,121.76/2,928.15 = 1,282.45/x
  3. Step 3: Cross multiply
    2,121.76x = 2,928.15 × 1,282.45
  4. Step 4: Simplify right side
    2,121.76x = 3,755,205.97
  5. Step 5: Solve for x
    x = 3,755,205.97/2,121.76
  6. Step 6: Final answer
    x = 1,769.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.