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Finding the Fourth Proportional to 8,138.77, 12,209.11 and 2,590.17

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Solution

The fourth proportional to 8,138.77, 12,209.11 and 2,590.17 is: 3,885.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.77 : 12,209.11 = 2,590.17 : x
  2. Step 2: Convert to fraction form
    8,138.77/12,209.11 = 2,590.17/x
  3. Step 3: Cross multiply
    8,138.77x = 12,209.11 × 2,590.17
  4. Step 4: Simplify right side
    8,138.77x = 31,623,670.45
  5. Step 5: Solve for x
    x = 31,623,670.45/8,138.77
  6. Step 6: Final answer
    x = 3,885.56

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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.