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Finding the Fourth Proportional to 143.46, 214.78 and 91.98

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Solution

The fourth proportional to 143.46, 214.78 and 91.98 is: 137.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.46 : 214.78 = 91.98 : x
  2. Step 2: Convert to fraction form
    143.46/214.78 = 91.98/x
  3. Step 3: Cross multiply
    143.46x = 214.78 × 91.98
  4. Step 4: Simplify right side
    143.46x = 19,755.46
  5. Step 5: Solve for x
    x = 19,755.46/143.46
  6. Step 6: Final answer
    x = 137.71

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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.