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Finding the Fourth Proportional to 342.18, 472.26 and 231.72

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Solution

The fourth proportional to 342.18, 472.26 and 231.72 is: 319.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.18 : 472.26 = 231.72 : x
  2. Step 2: Convert to fraction form
    342.18/472.26 = 231.72/x
  3. Step 3: Cross multiply
    342.18x = 472.26 × 231.72
  4. Step 4: Simplify right side
    342.18x = 109,432.09
  5. Step 5: Solve for x
    x = 109,432.09/342.18
  6. Step 6: Final answer
    x = 319.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.