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Finding the Fourth Proportional to 231.77, 319.88 and 158.11

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Solution

The fourth proportional to 231.77, 319.88 and 158.11 is: 218.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.77 : 319.88 = 158.11 : x
  2. Step 2: Convert to fraction form
    231.77/319.88 = 158.11/x
  3. Step 3: Cross multiply
    231.77x = 319.88 × 158.11
  4. Step 4: Simplify right side
    231.77x = 50,575.82
  5. Step 5: Solve for x
    x = 50,575.82/231.77
  6. Step 6: Final answer
    x = 218.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.