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Finding the Fourth Proportional to 215.29, 321.31 and 190.99

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Solution

The fourth proportional to 215.29, 321.31 and 190.99 is: 285.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.29 : 321.31 = 190.99 : x
  2. Step 2: Convert to fraction form
    215.29/321.31 = 190.99/x
  3. Step 3: Cross multiply
    215.29x = 321.31 × 190.99
  4. Step 4: Simplify right side
    215.29x = 61,367.00
  5. Step 5: Solve for x
    x = 61,367.00/215.29
  6. Step 6: Final answer
    x = 285.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.