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Finding the Fourth Proportional to 231.19, 318.05 and 199.87

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Solution

The fourth proportional to 231.19, 318.05 and 199.87 is: 274.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.19 : 318.05 = 199.87 : x
  2. Step 2: Convert to fraction form
    231.19/318.05 = 199.87/x
  3. Step 3: Cross multiply
    231.19x = 318.05 × 199.87
  4. Step 4: Simplify right side
    231.19x = 63,567.65
  5. Step 5: Solve for x
    x = 63,567.65/231.19
  6. Step 6: Final answer
    x = 274.96

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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.