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Finding the Fourth Proportional to 15,019.53, 20,719.09 and 12,190.10

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Solution

The fourth proportional to 15,019.53, 20,719.09 and 12,190.10 is: 16,815.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,019.53 : 20,719.09 = 12,190.10 : x
  2. Step 2: Convert to fraction form
    15,019.53/20,719.09 = 12,190.10/x
  3. Step 3: Cross multiply
    15,019.53x = 20,719.09 × 12,190.10
  4. Step 4: Simplify right side
    15,019.53x = 252,567,690.65
  5. Step 5: Solve for x
    x = 252,567,690.65/15,019.53
  6. Step 6: Final answer
    x = 16,815.96

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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.