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Finding the Fourth Proportional to 304.50, 456.81 and 142.20

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Solution

The fourth proportional to 304.50, 456.81 and 142.20 is: 213.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.50 : 456.81 = 142.20 : x
  2. Step 2: Convert to fraction form
    304.50/456.81 = 142.20/x
  3. Step 3: Cross multiply
    304.50x = 456.81 × 142.20
  4. Step 4: Simplify right side
    304.50x = 64,958.38
  5. Step 5: Solve for x
    x = 64,958.38/304.50
  6. Step 6: Final answer
    x = 213.33

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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.