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Finding the Fourth Proportional to 304.30, 455.82 and 142.12

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Solution

The fourth proportional to 304.30, 455.82 and 142.12 is: 212.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.30 : 455.82 = 142.12 : x
  2. Step 2: Convert to fraction form
    304.30/455.82 = 142.12/x
  3. Step 3: Cross multiply
    304.30x = 455.82 × 142.12
  4. Step 4: Simplify right side
    304.30x = 64,781.14
  5. Step 5: Solve for x
    x = 64,781.14/304.30
  6. Step 6: Final answer
    x = 212.89

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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.