Home / 21,144.70-31,729.20-7,998.40

Finding the Fourth Proportional to 21,144.70, 31,729.20 and 7,998.40

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Solution

The fourth proportional to 21,144.70, 31,729.20 and 7,998.40 is: 12,002.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144.70 : 31,729.20 = 7,998.40 : x
  2. Step 2: Convert to fraction form
    21,144.70/31,729.20 = 7,998.40/x
  3. Step 3: Cross multiply
    21,144.70x = 31,729.20 × 7,998.40
  4. Step 4: Simplify right side
    21,144.70x = 253,782,833.28
  5. Step 5: Solve for x
    x = 253,782,833.28/21,144.70
  6. Step 6: Final answer
    x = 12,002.20

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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.