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Finding the Fourth Proportional to 18,959.40, 28,439.10 and 10,198.44

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Solution

The fourth proportional to 18,959.40, 28,439.10 and 10,198.44 is: 15,297.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.40 : 28,439.10 = 10,198.44 : x
  2. Step 2: Convert to fraction form
    18,959.40/28,439.10 = 10,198.44/x
  3. Step 3: Cross multiply
    18,959.40x = 28,439.10 × 10,198.44
  4. Step 4: Simplify right side
    18,959.40x = 290,034,455.00
  5. Step 5: Solve for x
    x = 290,034,455.00/18,959.40
  6. Step 6: Final answer
    x = 15,297.66

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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.