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Finding the Fourth Proportional to 215.62, 323.58 and 147.21

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Solution

The fourth proportional to 215.62, 323.58 and 147.21 is: 220.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.62 : 323.58 = 147.21 : x
  2. Step 2: Convert to fraction form
    215.62/323.58 = 147.21/x
  3. Step 3: Cross multiply
    215.62x = 323.58 × 147.21
  4. Step 4: Simplify right side
    215.62x = 47,634.21
  5. Step 5: Solve for x
    x = 47,634.21/215.62
  6. Step 6: Final answer
    x = 220.92

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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.