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Finding the Fourth Proportional to 231.11, 318.58 and 148.20

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Solution

The fourth proportional to 231.11, 318.58 and 148.20 is: 204.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.11 : 318.58 = 148.20 : x
  2. Step 2: Convert to fraction form
    231.11/318.58 = 148.20/x
  3. Step 3: Cross multiply
    231.11x = 318.58 × 148.20
  4. Step 4: Simplify right side
    231.11x = 47,213.56
  5. Step 5: Solve for x
    x = 47,213.56/231.11
  6. Step 6: Final answer
    x = 204.29

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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.