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Finding the Fourth Proportional to 215.61, 323.55 and 153.96

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Solution

The fourth proportional to 215.61, 323.55 and 153.96 is: 231.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.61 : 323.55 = 153.96 : x
  2. Step 2: Convert to fraction form
    215.61/323.55 = 153.96/x
  3. Step 3: Cross multiply
    215.61x = 323.55 × 153.96
  4. Step 4: Simplify right side
    215.61x = 49,813.76
  5. Step 5: Solve for x
    x = 49,813.76/215.61
  6. Step 6: Final answer
    x = 231.04

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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.