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Finding the Fourth Proportional to 231.88, 319.90 and 153.23

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Solution

The fourth proportional to 231.88, 319.90 and 153.23 is: 211.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.88 : 319.90 = 153.23 : x
  2. Step 2: Convert to fraction form
    231.88/319.90 = 153.23/x
  3. Step 3: Cross multiply
    231.88x = 319.90 × 153.23
  4. Step 4: Simplify right side
    231.88x = 49,017.69
  5. Step 5: Solve for x
    x = 49,017.69/231.88
  6. Step 6: Final answer
    x = 211.40

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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.