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Finding the Fourth Proportional to 231.80, 347.31 and 140.22

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Solution

The fourth proportional to 231.80, 347.31 and 140.22 is: 210.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.80 : 347.31 = 140.22 : x
  2. Step 2: Convert to fraction form
    231.80/347.31 = 140.22/x
  3. Step 3: Cross multiply
    231.80x = 347.31 × 140.22
  4. Step 4: Simplify right side
    231.80x = 48,699.81
  5. Step 5: Solve for x
    x = 48,699.81/231.80
  6. Step 6: Final answer
    x = 210.09

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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.