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Finding the Fourth Proportional to 194.84, 268.73 and 128.31

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Solution

The fourth proportional to 194.84, 268.73 and 128.31 is: 176.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.84 : 268.73 = 128.31 : x
  2. Step 2: Convert to fraction form
    194.84/268.73 = 128.31/x
  3. Step 3: Cross multiply
    194.84x = 268.73 × 128.31
  4. Step 4: Simplify right side
    194.84x = 34,480.10
  5. Step 5: Solve for x
    x = 34,480.10/194.84
  6. Step 6: Final answer
    x = 176.97

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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.