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Finding the Fourth Proportional to 231.72, 347.28 and 140.45

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Solution

The fourth proportional to 231.72, 347.28 and 140.45 is: 210.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.72 : 347.28 = 140.45 : x
  2. Step 2: Convert to fraction form
    231.72/347.28 = 140.45/x
  3. Step 3: Cross multiply
    231.72x = 347.28 × 140.45
  4. Step 4: Simplify right side
    231.72x = 48,773.74
  5. Step 5: Solve for x
    x = 48,773.74/231.72
  6. Step 6: Final answer
    x = 210.49

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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.