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Finding the Fourth Proportional to 231.98, 347.51 and 140.40

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Solution

The fourth proportional to 231.98, 347.51 and 140.40 is: 210.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.98 : 347.51 = 140.40 : x
  2. Step 2: Convert to fraction form
    231.98/347.51 = 140.40/x
  3. Step 3: Cross multiply
    231.98x = 347.51 × 140.40
  4. Step 4: Simplify right side
    231.98x = 48,789.70
  5. Step 5: Solve for x
    x = 48,789.70/231.98
  6. Step 6: Final answer
    x = 210.32

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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.