Home / 21,238.60-31,793.10-18,905.80

Finding the Fourth Proportional to 21,238.60, 31,793.10 and 18,905.80

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Solution

The fourth proportional to 21,238.60, 31,793.10 and 18,905.80 is: 28,301.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,238.60 : 31,793.10 = 18,905.80 : x
  2. Step 2: Convert to fraction form
    21,238.60/31,793.10 = 18,905.80/x
  3. Step 3: Cross multiply
    21,238.60x = 31,793.10 × 18,905.80
  4. Step 4: Simplify right side
    21,238.60x = 601,073,989.98
  5. Step 5: Solve for x
    x = 601,073,989.98/21,238.60
  6. Step 6: Final answer
    x = 28,301.02

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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.