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Finding the Fourth Proportional to 231.29, 347.29 and 145.17

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Solution

The fourth proportional to 231.29, 347.29 and 145.17 is: 217.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.29 : 347.29 = 145.17 : x
  2. Step 2: Convert to fraction form
    231.29/347.29 = 145.17/x
  3. Step 3: Cross multiply
    231.29x = 347.29 × 145.17
  4. Step 4: Simplify right side
    231.29x = 50,416.09
  5. Step 5: Solve for x
    x = 50,416.09/231.29
  6. Step 6: Final answer
    x = 217.98

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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.