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Finding the Fourth Proportional to 231.46, 319.26 and 215.83

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Solution

The fourth proportional to 231.46, 319.26 and 215.83 is: 297.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.46 : 319.26 = 215.83 : x
  2. Step 2: Convert to fraction form
    231.46/319.26 = 215.83/x
  3. Step 3: Cross multiply
    231.46x = 319.26 × 215.83
  4. Step 4: Simplify right side
    231.46x = 68,905.89
  5. Step 5: Solve for x
    x = 68,905.89/231.46
  6. Step 6: Final answer
    x = 297.70

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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.