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Finding the Fourth Proportional to 231.21, 318.81 and 148.20

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Solution

The fourth proportional to 231.21, 318.81 and 148.20 is: 204.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.21 : 318.81 = 148.20 : x
  2. Step 2: Convert to fraction form
    231.21/318.81 = 148.20/x
  3. Step 3: Cross multiply
    231.21x = 318.81 × 148.20
  4. Step 4: Simplify right side
    231.21x = 47,247.64
  5. Step 5: Solve for x
    x = 47,247.64/231.21
  6. Step 6: Final answer
    x = 204.35

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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.