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Finding the Fourth Proportional to 15,121.50, 20,866.49 and 8,406.72

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Solution

The fourth proportional to 15,121.50, 20,866.49 and 8,406.72 is: 11,600.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.50 : 20,866.49 = 8,406.72 : x
  2. Step 2: Convert to fraction form
    15,121.50/20,866.49 = 8,406.72/x
  3. Step 3: Cross multiply
    15,121.50x = 20,866.49 × 8,406.72
  4. Step 4: Simplify right side
    15,121.50x = 175,418,738.81
  5. Step 5: Solve for x
    x = 175,418,738.81/15,121.50
  6. Step 6: Final answer
    x = 11,600.62

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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.