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Finding the Fourth Proportional to 18,731.20, 28,129.20 and 12,186.40

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Solution

The fourth proportional to 18,731.20, 28,129.20 and 12,186.40 is: 18,300.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.20 : 28,129.20 = 12,186.40 : x
  2. Step 2: Convert to fraction form
    18,731.20/28,129.20 = 12,186.40/x
  3. Step 3: Cross multiply
    18,731.20x = 28,129.20 × 12,186.40
  4. Step 4: Simplify right side
    18,731.20x = 342,793,682.88
  5. Step 5: Solve for x
    x = 342,793,682.88/18,731.20
  6. Step 6: Final answer
    x = 18,300.68

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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.