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Finding the Fourth Proportional to 8,140.79, 12,211.20 and 3,981.14

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Solution

The fourth proportional to 8,140.79, 12,211.20 and 3,981.14 is: 5,971.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140.79 : 12,211.20 = 3,981.14 : x
  2. Step 2: Convert to fraction form
    8,140.79/12,211.20 = 3,981.14/x
  3. Step 3: Cross multiply
    8,140.79x = 12,211.20 × 3,981.14
  4. Step 4: Simplify right side
    8,140.79x = 48,614,496.77
  5. Step 5: Solve for x
    x = 48,614,496.77/8,140.79
  6. Step 6: Final answer
    x = 5,971.72

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Double scale
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Similar ratio
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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.