Home / 20,139.05-30,217.08-10,138.58

Finding the Fourth Proportional to 20,139.05, 30,217.08 and 10,138.58

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Solution

The fourth proportional to 20,139.05, 30,217.08 and 10,138.58 is: 15,212.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.05 : 30,217.08 = 10,138.58 : x
  2. Step 2: Convert to fraction form
    20,139.05/30,217.08 = 10,138.58/x
  3. Step 3: Cross multiply
    20,139.05x = 30,217.08 × 10,138.58
  4. Step 4: Simplify right side
    20,139.05x = 306,358,282.95
  5. Step 5: Solve for x
    x = 306,358,282.95/20,139.05
  6. Step 6: Final answer
    x = 15,212.15

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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.