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Finding the Fourth Proportional to 215.19, 323.01 and 198.99

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Solution

The fourth proportional to 215.19, 323.01 and 198.99 is: 298.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.19 : 323.01 = 198.99 : x
  2. Step 2: Convert to fraction form
    215.19/323.01 = 198.99/x
  3. Step 3: Cross multiply
    215.19x = 323.01 × 198.99
  4. Step 4: Simplify right side
    215.19x = 64,275.76
  5. Step 5: Solve for x
    x = 64,275.76/215.19
  6. Step 6: Final answer
    x = 298.69

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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.