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Finding the Fourth Proportional to 18,876.11, 28,336.04 and 10,128.11

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Solution

The fourth proportional to 18,876.11, 28,336.04 and 10,128.11 is: 15,203.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,876.11 : 28,336.04 = 10,128.11 : x
  2. Step 2: Convert to fraction form
    18,876.11/28,336.04 = 10,128.11/x
  3. Step 3: Cross multiply
    18,876.11x = 28,336.04 × 10,128.11
  4. Step 4: Simplify right side
    18,876.11x = 286,990,613.58
  5. Step 5: Solve for x
    x = 286,990,613.58/18,876.11
  6. Step 6: Final answer
    x = 15,203.90

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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.