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Finding the Fourth Proportional to 306.05, 421.12 and 298.76

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Solution

The fourth proportional to 306.05, 421.12 and 298.76 is: 411.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.05 : 421.12 = 298.76 : x
  2. Step 2: Convert to fraction form
    306.05/421.12 = 298.76/x
  3. Step 3: Cross multiply
    306.05x = 421.12 × 298.76
  4. Step 4: Simplify right side
    306.05x = 125,814.12
  5. Step 5: Solve for x
    x = 125,814.12/306.05
  6. Step 6: Final answer
    x = 411.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.