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Finding the Fourth Proportional to 186.66, 257.64 and 128.46

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Solution

The fourth proportional to 186.66, 257.64 and 128.46 is: 177.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.66 : 257.64 = 128.46 : x
  2. Step 2: Convert to fraction form
    186.66/257.64 = 128.46/x
  3. Step 3: Cross multiply
    186.66x = 257.64 × 128.46
  4. Step 4: Simplify right side
    186.66x = 33,096.43
  5. Step 5: Solve for x
    x = 33,096.43/186.66
  6. Step 6: Final answer
    x = 177.31

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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.