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Finding the Fourth Proportional to 18,993.10, 28,489.84 and 12,460.72

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Solution

The fourth proportional to 18,993.10, 28,489.84 and 12,460.72 is: 18,691.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.10 : 28,489.84 = 12,460.72 : x
  2. Step 2: Convert to fraction form
    18,993.10/28,489.84 = 12,460.72/x
  3. Step 3: Cross multiply
    18,993.10x = 28,489.84 × 12,460.72
  4. Step 4: Simplify right side
    18,993.10x = 355,003,919.08
  5. Step 5: Solve for x
    x = 355,003,919.08/18,993.10
  6. Step 6: Final answer
    x = 18,691.20

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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.