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Finding the Fourth Proportional to 13,999.30, 20,998.95 and 7,422.10

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Solution

The fourth proportional to 13,999.30, 20,998.95 and 7,422.10 is: 11,133.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.30 : 20,998.95 = 7,422.10 : x
  2. Step 2: Convert to fraction form
    13,999.30/20,998.95 = 7,422.10/x
  3. Step 3: Cross multiply
    13,999.30x = 20,998.95 × 7,422.10
  4. Step 4: Simplify right side
    13,999.30x = 155,856,306.80
  5. Step 5: Solve for x
    x = 155,856,306.80/13,999.30
  6. Step 6: Final answer
    x = 11,133.15

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Similar ratio
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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.