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Finding the Fourth Proportional to 8,642.87, 12,964.22 and 3,961.55

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Solution

The fourth proportional to 8,642.87, 12,964.22 and 3,961.55 is: 5,942.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.87 : 12,964.22 = 3,961.55 : x
  2. Step 2: Convert to fraction form
    8,642.87/12,964.22 = 3,961.55/x
  3. Step 3: Cross multiply
    8,642.87x = 12,964.22 × 3,961.55
  4. Step 4: Simplify right side
    8,642.87x = 51,358,405.74
  5. Step 5: Solve for x
    x = 51,358,405.74/8,642.87
  6. Step 6: Final answer
    x = 5,942.29

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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.