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Finding the Fourth Proportional to 20,040.78, 30,065.27 and 6,891.45

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Solution

The fourth proportional to 20,040.78, 30,065.27 and 6,891.45 is: 10,338.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,040.78 : 30,065.27 = 6,891.45 : x
  2. Step 2: Convert to fraction form
    20,040.78/30,065.27 = 6,891.45/x
  3. Step 3: Cross multiply
    20,040.78x = 30,065.27 × 6,891.45
  4. Step 4: Simplify right side
    20,040.78x = 207,193,304.94
  5. Step 5: Solve for x
    x = 207,193,304.94/20,040.78
  6. Step 6: Final answer
    x = 10,338.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.