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Finding the Fourth Proportional to 2,616.80, 3,920.18 and 2,528.86

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Solution

The fourth proportional to 2,616.80, 3,920.18 and 2,528.86 is: 3,788.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,616.80 : 3,920.18 = 2,528.86 : x
  2. Step 2: Convert to fraction form
    2,616.80/3,920.18 = 2,528.86/x
  3. Step 3: Cross multiply
    2,616.80x = 3,920.18 × 2,528.86
  4. Step 4: Simplify right side
    2,616.80x = 9,913,586.39
  5. Step 5: Solve for x
    x = 9,913,586.39/2,616.80
  6. Step 6: Final answer
    x = 3,788.45

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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.