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Finding the Fourth Proportional to 2,809.76, 3,876.88 and 1,879.20

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Solution

The fourth proportional to 2,809.76, 3,876.88 and 1,879.20 is: 2,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.76 : 3,876.88 = 1,879.20 : x
  2. Step 2: Convert to fraction form
    2,809.76/3,876.88 = 1,879.20/x
  3. Step 3: Cross multiply
    2,809.76x = 3,876.88 × 1,879.20
  4. Step 4: Simplify right side
    2,809.76x = 7,285,432.90
  5. Step 5: Solve for x
    x = 7,285,432.90/2,809.76
  6. Step 6: Final answer
    x = 2,592.90

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1.5x scale

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.