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Finding the Fourth Proportional to 2,809.92, 3,872.16 and 2,147.52

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Solution

The fourth proportional to 2,809.92, 3,872.16 and 2,147.52 is: 2,959.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.92 : 3,872.16 = 2,147.52 : x
  2. Step 2: Convert to fraction form
    2,809.92/3,872.16 = 2,147.52/x
  3. Step 3: Cross multiply
    2,809.92x = 3,872.16 × 2,147.52
  4. Step 4: Simplify right side
    2,809.92x = 8,315,541.04
  5. Step 5: Solve for x
    x = 8,315,541.04/2,809.92
  6. Step 6: Final answer
    x = 2,959.35

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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.