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Finding the Fourth Proportional to 2,616.98, 3,925.60 and 669.20

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Solution

The fourth proportional to 2,616.98, 3,925.60 and 669.20 is: 1,003.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,616.98 : 3,925.60 = 669.20 : x
  2. Step 2: Convert to fraction form
    2,616.98/3,925.60 = 669.20/x
  3. Step 3: Cross multiply
    2,616.98x = 3,925.60 × 669.20
  4. Step 4: Simplify right side
    2,616.98x = 2,627,011.52
  5. Step 5: Solve for x
    x = 2,627,011.52/2,616.98
  6. Step 6: Final answer
    x = 1,003.83

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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.