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Finding the Fourth Proportional to 8,138.68, 12,209.20 and 2,590.20

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Solution

The fourth proportional to 8,138.68, 12,209.20 and 2,590.20 is: 3,885.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.68 : 12,209.20 = 2,590.20 : x
  2. Step 2: Convert to fraction form
    8,138.68/12,209.20 = 2,590.20/x
  3. Step 3: Cross multiply
    8,138.68x = 12,209.20 × 2,590.20
  4. Step 4: Simplify right side
    8,138.68x = 31,624,269.84
  5. Step 5: Solve for x
    x = 31,624,269.84/8,138.68
  6. Step 6: Final answer
    x = 3,885.68

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1.5x scale

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.