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Finding the Fourth Proportional to 8,371.80, 12,540.66 and 6,719.40

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Solution

The fourth proportional to 8,371.80, 12,540.66 and 6,719.40 is: 10,065.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,371.80 : 12,540.66 = 6,719.40 : x
  2. Step 2: Convert to fraction form
    8,371.80/12,540.66 = 6,719.40/x
  3. Step 3: Cross multiply
    8,371.80x = 12,540.66 × 6,719.40
  4. Step 4: Simplify right side
    8,371.80x = 84,265,710.80
  5. Step 5: Solve for x
    x = 84,265,710.80/8,371.80
  6. Step 6: Final answer
    x = 10,065.42

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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.