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Finding the Fourth Proportional to 186.82, 257.43 and 128.50

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Solution

The fourth proportional to 186.82, 257.43 and 128.50 is: 177.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.82 : 257.43 = 128.50 : x
  2. Step 2: Convert to fraction form
    186.82/257.43 = 128.50/x
  3. Step 3: Cross multiply
    186.82x = 257.43 × 128.50
  4. Step 4: Simplify right side
    186.82x = 33,079.76
  5. Step 5: Solve for x
    x = 33,079.76/186.82
  6. Step 6: Final answer
    x = 177.07

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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.