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Finding the Fourth Proportional to 18,872.60, 28,278.11 and 11,479.32

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Solution

The fourth proportional to 18,872.60, 28,278.11 and 11,479.32 is: 17,200.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.60 : 28,278.11 = 11,479.32 : x
  2. Step 2: Convert to fraction form
    18,872.60/28,278.11 = 11,479.32/x
  3. Step 3: Cross multiply
    18,872.60x = 28,278.11 × 11,479.32
  4. Step 4: Simplify right side
    18,872.60x = 324,613,502.38
  5. Step 5: Solve for x
    x = 324,613,502.38/18,872.60
  6. Step 6: Final answer
    x = 17,200.26

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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.