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Finding the Fourth Proportional to 18,980.69, 28,471.13 and 12,448.24

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Solution

The fourth proportional to 18,980.69, 28,471.13 and 12,448.24 is: 18,672.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.69 : 28,471.13 = 12,448.24 : x
  2. Step 2: Convert to fraction form
    18,980.69/28,471.13 = 12,448.24/x
  3. Step 3: Cross multiply
    18,980.69x = 28,471.13 × 12,448.24
  4. Step 4: Simplify right side
    18,980.69x = 354,415,372.57
  5. Step 5: Solve for x
    x = 354,415,372.57/18,980.69
  6. Step 6: Final answer
    x = 18,672.42

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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.