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Finding the Fourth Proportional to 8,061.40, 12,084.90 and 3,129.40

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Solution

The fourth proportional to 8,061.40, 12,084.90 and 3,129.40 is: 4,691.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,061.40 : 12,084.90 = 3,129.40 : x
  2. Step 2: Convert to fraction form
    8,061.40/12,084.90 = 3,129.40/x
  3. Step 3: Cross multiply
    8,061.40x = 12,084.90 × 3,129.40
  4. Step 4: Simplify right side
    8,061.40x = 37,818,486.06
  5. Step 5: Solve for x
    x = 37,818,486.06/8,061.40
  6. Step 6: Final answer
    x = 4,691.30

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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.