Home / 20,122.57-30,128.45-10,213.39

Finding the Fourth Proportional to 20,122.57, 30,128.45 and 10,213.39

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Solution

The fourth proportional to 20,122.57, 30,128.45 and 10,213.39 is: 15,291.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,122.57 : 30,128.45 = 10,213.39 : x
  2. Step 2: Convert to fraction form
    20,122.57/30,128.45 = 10,213.39/x
  3. Step 3: Cross multiply
    20,122.57x = 30,128.45 × 10,213.39
  4. Step 4: Simplify right side
    20,122.57x = 307,713,408.24
  5. Step 5: Solve for x
    x = 307,713,408.24/20,122.57
  6. Step 6: Final answer
    x = 15,291.95

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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.