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Finding the Fourth Proportional to 18,959.06, 28,438.49 and 4,919.08

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Solution

The fourth proportional to 18,959.06, 28,438.49 and 4,919.08 is: 7,378.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.06 : 28,438.49 = 4,919.08 : x
  2. Step 2: Convert to fraction form
    18,959.06/28,438.49 = 4,919.08/x
  3. Step 3: Cross multiply
    18,959.06x = 28,438.49 × 4,919.08
  4. Step 4: Simplify right side
    18,959.06x = 139,891,201.91
  5. Step 5: Solve for x
    x = 139,891,201.91/18,959.06
  6. Step 6: Final answer
    x = 7,378.59

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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.