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Finding the Fourth Proportional to 186.66, 257.49 and 128.43

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Solution

The fourth proportional to 186.66, 257.49 and 128.43 is: 177.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.66 : 257.49 = 128.43 : x
  2. Step 2: Convert to fraction form
    186.66/257.49 = 128.43/x
  3. Step 3: Cross multiply
    186.66x = 257.49 × 128.43
  4. Step 4: Simplify right side
    186.66x = 33,069.44
  5. Step 5: Solve for x
    x = 33,069.44/186.66
  6. Step 6: Final answer
    x = 177.16

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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.