Home / 20,422.78-28,181.93-11,471.78

Finding the Fourth Proportional to 20,422.78, 28,181.93 and 11,471.78

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Solution

The fourth proportional to 20,422.78, 28,181.93 and 11,471.78 is: 15,830.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.78 : 28,181.93 = 11,471.78 : x
  2. Step 2: Convert to fraction form
    20,422.78/28,181.93 = 11,471.78/x
  3. Step 3: Cross multiply
    20,422.78x = 28,181.93 × 11,471.78
  4. Step 4: Simplify right side
    20,422.78x = 323,296,755.51
  5. Step 5: Solve for x
    x = 323,296,755.51/20,422.78
  6. Step 6: Final answer
    x = 15,830.20

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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.