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Finding the Fourth Proportional to 1,769.76, 2,650.80 and 1,281.76

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Solution

The fourth proportional to 1,769.76, 2,650.80 and 1,281.76 is: 1,919.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,769.76 : 2,650.80 = 1,281.76 : x
  2. Step 2: Convert to fraction form
    1,769.76/2,650.80 = 1,281.76/x
  3. Step 3: Cross multiply
    1,769.76x = 2,650.80 × 1,281.76
  4. Step 4: Simplify right side
    1,769.76x = 3,397,689.41
  5. Step 5: Solve for x
    x = 3,397,689.41/1,769.76
  6. Step 6: Final answer
    x = 1,919.86

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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.