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Finding the Fourth Proportional to 306.94, 423.49 and 213.58

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Solution

The fourth proportional to 306.94, 423.49 and 213.58 is: 294.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.94 : 423.49 = 213.58 : x
  2. Step 2: Convert to fraction form
    306.94/423.49 = 213.58/x
  3. Step 3: Cross multiply
    306.94x = 423.49 × 213.58
  4. Step 4: Simplify right side
    306.94x = 90,448.99
  5. Step 5: Solve for x
    x = 90,448.99/306.94
  6. Step 6: Final answer
    x = 294.68

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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.