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Finding the Fourth Proportional to 186.48, 257.06 and 139.79

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Solution

The fourth proportional to 186.48, 257.06 and 139.79 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.48 : 257.06 = 139.79 : x
  2. Step 2: Convert to fraction form
    186.48/257.06 = 139.79/x
  3. Step 3: Cross multiply
    186.48x = 257.06 × 139.79
  4. Step 4: Simplify right side
    186.48x = 35,932.43
  5. Step 5: Solve for x
    x = 35,932.43/186.48
  6. Step 6: Final answer
    x = 192.69

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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.