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Finding the Fourth Proportional to 143.92, 214.79 and 142.98

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Solution

The fourth proportional to 143.92, 214.79 and 142.98 is: 213.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.92 : 214.79 = 142.98 : x
  2. Step 2: Convert to fraction form
    143.92/214.79 = 142.98/x
  3. Step 3: Cross multiply
    143.92x = 214.79 × 142.98
  4. Step 4: Simplify right side
    143.92x = 30,710.67
  5. Step 5: Solve for x
    x = 30,710.67/143.92
  6. Step 6: Final answer
    x = 213.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.