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Finding the Fourth Proportional to 15,121.88, 20,866.61 and 8,406.43

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Solution

The fourth proportional to 15,121.88, 20,866.61 and 8,406.43 is: 11,599.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.88 : 20,866.61 = 8,406.43 : x
  2. Step 2: Convert to fraction form
    15,121.88/20,866.61 = 8,406.43/x
  3. Step 3: Cross multiply
    15,121.88x = 20,866.61 × 8,406.43
  4. Step 4: Simplify right side
    15,121.88x = 175,413,665.15
  5. Step 5: Solve for x
    x = 175,413,665.15/15,121.88
  6. Step 6: Final answer
    x = 11,599.99

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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.