Home / 20,992.22-28,969.21-11,560.78

Finding the Fourth Proportional to 20,992.22, 28,969.21 and 11,560.78

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Solution

The fourth proportional to 20,992.22, 28,969.21 and 11,560.78 is: 15,953.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.22 : 28,969.21 = 11,560.78 : x
  2. Step 2: Convert to fraction form
    20,992.22/28,969.21 = 11,560.78/x
  3. Step 3: Cross multiply
    20,992.22x = 28,969.21 × 11,560.78
  4. Step 4: Simplify right side
    20,992.22x = 334,906,663.58
  5. Step 5: Solve for x
    x = 334,906,663.58/20,992.22
  6. Step 6: Final answer
    x = 15,953.85

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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.