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Finding the Fourth Proportional to 8,279.80, 12,408.90 and 3,345.40

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Solution

The fourth proportional to 8,279.80, 12,408.90 and 3,345.40 is: 5,013.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.80 : 12,408.90 = 3,345.40 : x
  2. Step 2: Convert to fraction form
    8,279.80/12,408.90 = 3,345.40/x
  3. Step 3: Cross multiply
    8,279.80x = 12,408.90 × 3,345.40
  4. Step 4: Simplify right side
    8,279.80x = 41,512,734.06
  5. Step 5: Solve for x
    x = 41,512,734.06/8,279.80
  6. Step 6: Final answer
    x = 5,013.74

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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.