Home / 20,901.96-31,343.22-12,139.38

Finding the Fourth Proportional to 20,901.96, 31,343.22 and 12,139.38

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Solution

The fourth proportional to 20,901.96, 31,343.22 and 12,139.38 is: 18,203.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.96 : 31,343.22 = 12,139.38 : x
  2. Step 2: Convert to fraction form
    20,901.96/31,343.22 = 12,139.38/x
  3. Step 3: Cross multiply
    20,901.96x = 31,343.22 × 12,139.38
  4. Step 4: Simplify right side
    20,901.96x = 380,487,258.00
  5. Step 5: Solve for x
    x = 380,487,258.00/20,901.96
  6. Step 6: Final answer
    x = 18,203.42

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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.