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Finding the Fourth Proportional to 8,919.76, 13,381.69 and 2,679.89

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Solution

The fourth proportional to 8,919.76, 13,381.69 and 2,679.89 is: 4,020.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.76 : 13,381.69 = 2,679.89 : x
  2. Step 2: Convert to fraction form
    8,919.76/13,381.69 = 2,679.89/x
  3. Step 3: Cross multiply
    8,919.76x = 13,381.69 × 2,679.89
  4. Step 4: Simplify right side
    8,919.76x = 35,861,463.90
  5. Step 5: Solve for x
    x = 35,861,463.90/8,919.76
  6. Step 6: Final answer
    x = 4,020.45

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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.