Home / 20,420.78-28,181.52-11,468.12

Finding the Fourth Proportional to 20,420.78, 28,181.52 and 11,468.12

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Solution

The fourth proportional to 20,420.78, 28,181.52 and 11,468.12 is: 15,826.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.78 : 28,181.52 = 11,468.12 : x
  2. Step 2: Convert to fraction form
    20,420.78/28,181.52 = 11,468.12/x
  3. Step 3: Cross multiply
    20,420.78x = 28,181.52 × 11,468.12
  4. Step 4: Simplify right side
    20,420.78x = 323,188,912.23
  5. Step 5: Solve for x
    x = 323,188,912.23/20,420.78
  6. Step 6: Final answer
    x = 15,826.48

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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.