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Finding the Fourth Proportional to 306.74, 423.57 and 248.90

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Solution

The fourth proportional to 306.74, 423.57 and 248.90 is: 343.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.74 : 423.57 = 248.90 : x
  2. Step 2: Convert to fraction form
    306.74/423.57 = 248.90/x
  3. Step 3: Cross multiply
    306.74x = 423.57 × 248.90
  4. Step 4: Simplify right side
    306.74x = 105,426.57
  5. Step 5: Solve for x
    x = 105,426.57/306.74
  6. Step 6: Final answer
    x = 343.70

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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.