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Finding the Fourth Proportional to 12,991.40, 19,487.10 and 4,227.20

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Solution

The fourth proportional to 12,991.40, 19,487.10 and 4,227.20 is: 6,340.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.40 : 19,487.10 = 4,227.20 : x
  2. Step 2: Convert to fraction form
    12,991.40/19,487.10 = 4,227.20/x
  3. Step 3: Cross multiply
    12,991.40x = 19,487.10 × 4,227.20
  4. Step 4: Simplify right side
    12,991.40x = 82,375,869.12
  5. Step 5: Solve for x
    x = 82,375,869.12/12,991.40
  6. Step 6: Final answer
    x = 6,340.80

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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.