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Finding the Fourth Proportional to 231.81, 347.72 and 129.08

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Solution

The fourth proportional to 231.81, 347.72 and 129.08 is: 193.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.81 : 347.72 = 129.08 : x
  2. Step 2: Convert to fraction form
    231.81/347.72 = 129.08/x
  3. Step 3: Cross multiply
    231.81x = 347.72 × 129.08
  4. Step 4: Simplify right side
    231.81x = 44,881.31
  5. Step 5: Solve for x
    x = 44,881.31/231.81
  6. Step 6: Final answer
    x = 193.61

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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.