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Finding the Fourth Proportional to 231.76, 319.85 and 133.55

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Solution

The fourth proportional to 231.76, 319.85 and 133.55 is: 184.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.76 : 319.85 = 133.55 : x
  2. Step 2: Convert to fraction form
    231.76/319.85 = 133.55/x
  3. Step 3: Cross multiply
    231.76x = 319.85 × 133.55
  4. Step 4: Simplify right side
    231.76x = 42,715.40
  5. Step 5: Solve for x
    x = 42,715.40/231.76
  6. Step 6: Final answer
    x = 184.31

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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.