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Finding the Fourth Proportional to 142.66, 213.92 and 51.34

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Solution

The fourth proportional to 142.66, 213.92 and 51.34 is: 76.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.66 : 213.92 = 51.34 : x
  2. Step 2: Convert to fraction form
    142.66/213.92 = 51.34/x
  3. Step 3: Cross multiply
    142.66x = 213.92 × 51.34
  4. Step 4: Simplify right side
    142.66x = 10,982.65
  5. Step 5: Solve for x
    x = 10,982.65/142.66
  6. Step 6: Final answer
    x = 76.98

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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.