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Finding the Fourth Proportional to 18,620.82, 28,059.48 and 15,406.20

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Solution

The fourth proportional to 18,620.82, 28,059.48 and 15,406.20 is: 23,215.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.82 : 28,059.48 = 15,406.20 : x
  2. Step 2: Convert to fraction form
    18,620.82/28,059.48 = 15,406.20/x
  3. Step 3: Cross multiply
    18,620.82x = 28,059.48 × 15,406.20
  4. Step 4: Simplify right side
    18,620.82x = 432,289,960.78
  5. Step 5: Solve for x
    x = 432,289,960.78/18,620.82
  6. Step 6: Final answer
    x = 23,215.41

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.