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Finding the Fourth Proportional to 306.60, 423.30 and 219.56

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Solution

The fourth proportional to 306.60, 423.30 and 219.56 is: 303.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.60 : 423.30 = 219.56 : x
  2. Step 2: Convert to fraction form
    306.60/423.30 = 219.56/x
  3. Step 3: Cross multiply
    306.60x = 423.30 × 219.56
  4. Step 4: Simplify right side
    306.60x = 92,939.75
  5. Step 5: Solve for x
    x = 92,939.75/306.60
  6. Step 6: Final answer
    x = 303.13

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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.