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Finding the Fourth Proportional to 231.46, 319.30 and 157.66

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Solution

The fourth proportional to 231.46, 319.30 and 157.66 is: 217.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.46 : 319.30 = 157.66 : x
  2. Step 2: Convert to fraction form
    231.46/319.30 = 157.66/x
  3. Step 3: Cross multiply
    231.46x = 319.30 × 157.66
  4. Step 4: Simplify right side
    231.46x = 50,339.65
  5. Step 5: Solve for x
    x = 50,339.65/231.46
  6. Step 6: Final answer
    x = 217.49

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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.