Home / 20,128.47-30,232.95-12,139.21

Finding the Fourth Proportional to 20,128.47, 30,232.95 and 12,139.21

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Solution

The fourth proportional to 20,128.47, 30,232.95 and 12,139.21 is: 18,233.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.47 : 30,232.95 = 12,139.21 : x
  2. Step 2: Convert to fraction form
    20,128.47/30,232.95 = 12,139.21/x
  3. Step 3: Cross multiply
    20,128.47x = 30,232.95 × 12,139.21
  4. Step 4: Simplify right side
    20,128.47x = 367,004,128.97
  5. Step 5: Solve for x
    x = 367,004,128.97/20,128.47
  6. Step 6: Final answer
    x = 18,233.09

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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.