Home / 20,201.20-30,301.80-12,838.30

Finding the Fourth Proportional to 20,201.20, 30,301.80 and 12,838.30

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Solution

The fourth proportional to 20,201.20, 30,301.80 and 12,838.30 is: 19,257.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,201.20 : 30,301.80 = 12,838.30 : x
  2. Step 2: Convert to fraction form
    20,201.20/30,301.80 = 12,838.30/x
  3. Step 3: Cross multiply
    20,201.20x = 30,301.80 × 12,838.30
  4. Step 4: Simplify right side
    20,201.20x = 389,023,598.94
  5. Step 5: Solve for x
    x = 389,023,598.94/20,201.20
  6. Step 6: Final answer
    x = 19,257.45

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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.