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Finding the Fourth Proportional to 231.39, 318.99 and 157.58

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Solution

The fourth proportional to 231.39, 318.99 and 157.58 is: 217.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.39 : 318.99 = 157.58 : x
  2. Step 2: Convert to fraction form
    231.39/318.99 = 157.58/x
  3. Step 3: Cross multiply
    231.39x = 318.99 × 157.58
  4. Step 4: Simplify right side
    231.39x = 50,265.75
  5. Step 5: Solve for x
    x = 50,265.75/231.39
  6. Step 6: Final answer
    x = 217.23

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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.