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Finding the Fourth Proportional to 3,989.92, 5,501.92 and 3,432.16

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Solution

The fourth proportional to 3,989.92, 5,501.92 and 3,432.16 is: 4,732.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.92 : 5,501.92 = 3,432.16 : x
  2. Step 2: Convert to fraction form
    3,989.92/5,501.92 = 3,432.16/x
  3. Step 3: Cross multiply
    3,989.92x = 5,501.92 × 3,432.16
  4. Step 4: Simplify right side
    3,989.92x = 18,883,469.75
  5. Step 5: Solve for x
    x = 18,883,469.75/3,989.92
  6. Step 6: Final answer
    x = 4,732.79

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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.