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Finding the Fourth Proportional to 231.13, 318.76 and 148.21

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Solution

The fourth proportional to 231.13, 318.76 and 148.21 is: 204.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.13 : 318.76 = 148.21 : x
  2. Step 2: Convert to fraction form
    231.13/318.76 = 148.21/x
  3. Step 3: Cross multiply
    231.13x = 318.76 × 148.21
  4. Step 4: Simplify right side
    231.13x = 47,241.08
  5. Step 5: Solve for x
    x = 47,241.08/231.13
  6. Step 6: Final answer
    x = 204.40

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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.