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Finding the Fourth Proportional to 231.90, 347.49 and 145.14

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Solution

The fourth proportional to 231.90, 347.49 and 145.14 is: 217.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.90 : 347.49 = 145.14 : x
  2. Step 2: Convert to fraction form
    231.90/347.49 = 145.14/x
  3. Step 3: Cross multiply
    231.90x = 347.49 × 145.14
  4. Step 4: Simplify right side
    231.90x = 50,434.70
  5. Step 5: Solve for x
    x = 50,434.70/231.90
  6. Step 6: Final answer
    x = 217.48

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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.