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Finding the Fourth Proportional to 142.72, 213.99 and 104.44

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Solution

The fourth proportional to 142.72, 213.99 and 104.44 is: 156.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.72 : 213.99 = 104.44 : x
  2. Step 2: Convert to fraction form
    142.72/213.99 = 104.44/x
  3. Step 3: Cross multiply
    142.72x = 213.99 × 104.44
  4. Step 4: Simplify right side
    142.72x = 22,349.12
  5. Step 5: Solve for x
    x = 22,349.12/142.72
  6. Step 6: Final answer
    x = 156.59

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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.