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Finding the Fourth Proportional to 231.21, 346.80 and 99.44

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Solution

The fourth proportional to 231.21, 346.80 and 99.44 is: 149.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.21 : 346.80 = 99.44 : x
  2. Step 2: Convert to fraction form
    231.21/346.80 = 99.44/x
  3. Step 3: Cross multiply
    231.21x = 346.80 × 99.44
  4. Step 4: Simplify right side
    231.21x = 34,485.79
  5. Step 5: Solve for x
    x = 34,485.79/231.21
  6. Step 6: Final answer
    x = 149.15

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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.