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Finding the Fourth Proportional to 231.84, 319.96 and 128.36

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Solution

The fourth proportional to 231.84, 319.96 and 128.36 is: 177.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.84 : 319.96 = 128.36 : x
  2. Step 2: Convert to fraction form
    231.84/319.96 = 128.36/x
  3. Step 3: Cross multiply
    231.84x = 319.96 × 128.36
  4. Step 4: Simplify right side
    231.84x = 41,070.07
  5. Step 5: Solve for x
    x = 41,070.07/231.84
  6. Step 6: Final answer
    x = 177.15

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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.