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Finding the Fourth Proportional to 186.21, 257.34 and 139.74

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Solution

The fourth proportional to 186.21, 257.34 and 139.74 is: 193.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.21 : 257.34 = 139.74 : x
  2. Step 2: Convert to fraction form
    186.21/257.34 = 139.74/x
  3. Step 3: Cross multiply
    186.21x = 257.34 × 139.74
  4. Step 4: Simplify right side
    186.21x = 35,960.69
  5. Step 5: Solve for x
    x = 35,960.69/186.21
  6. Step 6: Final answer
    x = 193.12

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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.