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Finding the Fourth Proportional to 186.74, 257.47 and 139.49

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Solution

The fourth proportional to 186.74, 257.47 and 139.49 is: 192.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.74 : 257.47 = 139.49 : x
  2. Step 2: Convert to fraction form
    186.74/257.47 = 139.49/x
  3. Step 3: Cross multiply
    186.74x = 257.47 × 139.49
  4. Step 4: Simplify right side
    186.74x = 35,913.79
  5. Step 5: Solve for x
    x = 35,913.79/186.74
  6. Step 6: Final answer
    x = 192.32

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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.