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Finding the Fourth Proportional to 186.31, 257.21 and 127.38

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Solution

The fourth proportional to 186.31, 257.21 and 127.38 is: 175.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.31 : 257.21 = 127.38 : x
  2. Step 2: Convert to fraction form
    186.31/257.21 = 127.38/x
  3. Step 3: Cross multiply
    186.31x = 257.21 × 127.38
  4. Step 4: Simplify right side
    186.31x = 32,763.41
  5. Step 5: Solve for x
    x = 32,763.41/186.31
  6. Step 6: Final answer
    x = 175.85

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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.