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Finding the Fourth Proportional to 215.34, 323.15 and 191.31

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Solution

The fourth proportional to 215.34, 323.15 and 191.31 is: 287.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.34 : 323.15 = 191.31 : x
  2. Step 2: Convert to fraction form
    215.34/323.15 = 191.31/x
  3. Step 3: Cross multiply
    215.34x = 323.15 × 191.31
  4. Step 4: Simplify right side
    215.34x = 61,820.87
  5. Step 5: Solve for x
    x = 61,820.87/215.34
  6. Step 6: Final answer
    x = 287.08

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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.