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Finding the Fourth Proportional to 18,822.51, 28,215.41 and 8,959.14

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Solution

The fourth proportional to 18,822.51, 28,215.41 and 8,959.14 is: 13,429.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,822.51 : 28,215.41 = 8,959.14 : x
  2. Step 2: Convert to fraction form
    18,822.51/28,215.41 = 8,959.14/x
  3. Step 3: Cross multiply
    18,822.51x = 28,215.41 × 8,959.14
  4. Step 4: Simplify right side
    18,822.51x = 252,785,763.55
  5. Step 5: Solve for x
    x = 252,785,763.55/18,822.51
  6. Step 6: Final answer
    x = 13,429.97

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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.