Home / 20,940.93-28,901.61-13,390.92

Finding the Fourth Proportional to 20,940.93, 28,901.61 and 13,390.92

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Solution

The fourth proportional to 20,940.93, 28,901.61 and 13,390.92 is: 18,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.93 : 28,901.61 = 13,390.92 : x
  2. Step 2: Convert to fraction form
    20,940.93/28,901.61 = 13,390.92/x
  3. Step 3: Cross multiply
    20,940.93x = 28,901.61 × 13,390.92
  4. Step 4: Simplify right side
    20,940.93x = 387,019,147.38
  5. Step 5: Solve for x
    x = 387,019,147.38/20,940.93
  6. Step 6: Final answer
    x = 18,481.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.