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Finding the Fourth Proportional to 3,318.80, 4,981.40 and 2,832.40

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Solution

The fourth proportional to 3,318.80, 4,981.40 and 2,832.40 is: 4,251.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.80 : 4,981.40 = 2,832.40 : x
  2. Step 2: Convert to fraction form
    3,318.80/4,981.40 = 2,832.40/x
  3. Step 3: Cross multiply
    3,318.80x = 4,981.40 × 2,832.40
  4. Step 4: Simplify right side
    3,318.80x = 14,109,317.36
  5. Step 5: Solve for x
    x = 14,109,317.36/3,318.80
  6. Step 6: Final answer
    x = 4,251.33

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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.