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Finding the Fourth Proportional to 223.67, 335.78 and 142.85

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Solution

The fourth proportional to 223.67, 335.78 and 142.85 is: 214.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.67 : 335.78 = 142.85 : x
  2. Step 2: Convert to fraction form
    223.67/335.78 = 142.85/x
  3. Step 3: Cross multiply
    223.67x = 335.78 × 142.85
  4. Step 4: Simplify right side
    223.67x = 47,966.17
  5. Step 5: Solve for x
    x = 47,966.17/223.67
  6. Step 6: Final answer
    x = 214.45

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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.