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Finding the Fourth Proportional to 15,120.87, 20,867.52 and 8,406.61

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Solution

The fourth proportional to 15,120.87, 20,867.52 and 8,406.61 is: 11,601.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.87 : 20,867.52 = 8,406.61 : x
  2. Step 2: Convert to fraction form
    15,120.87/20,867.52 = 8,406.61/x
  3. Step 3: Cross multiply
    15,120.87x = 20,867.52 × 8,406.61
  4. Step 4: Simplify right side
    15,120.87x = 175,425,102.31
  5. Step 5: Solve for x
    x = 175,425,102.31/15,120.87
  6. Step 6: Final answer
    x = 11,601.52

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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.