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Finding the Fourth Proportional to 8,619.72, 11,891.14 and 7,374.15

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Solution

The fourth proportional to 8,619.72, 11,891.14 and 7,374.15 is: 10,172.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.72 : 11,891.14 = 7,374.15 : x
  2. Step 2: Convert to fraction form
    8,619.72/11,891.14 = 7,374.15/x
  3. Step 3: Cross multiply
    8,619.72x = 11,891.14 × 7,374.15
  4. Step 4: Simplify right side
    8,619.72x = 87,687,031.60
  5. Step 5: Solve for x
    x = 87,687,031.60/8,619.72
  6. Step 6: Final answer
    x = 10,172.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.