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Finding the Fourth Proportional to 306.39, 459.59 and 215.85

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Solution

The fourth proportional to 306.39, 459.59 and 215.85 is: 323.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.39 : 459.59 = 215.85 : x
  2. Step 2: Convert to fraction form
    306.39/459.59 = 215.85/x
  3. Step 3: Cross multiply
    306.39x = 459.59 × 215.85
  4. Step 4: Simplify right side
    306.39x = 99,201.42
  5. Step 5: Solve for x
    x = 99,201.42/306.39
  6. Step 6: Final answer
    x = 323.78

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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.