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Finding the Fourth Proportional to 231.21, 318.68 and 187.47

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Solution

The fourth proportional to 231.21, 318.68 and 187.47 is: 258.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.21 : 318.68 = 187.47 : x
  2. Step 2: Convert to fraction form
    231.21/318.68 = 187.47/x
  3. Step 3: Cross multiply
    231.21x = 318.68 × 187.47
  4. Step 4: Simplify right side
    231.21x = 59,742.00
  5. Step 5: Solve for x
    x = 59,742.00/231.21
  6. Step 6: Final answer
    x = 258.39

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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.