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Finding the Fourth Proportional to 188.38, 282.78 and 139.48

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Solution

The fourth proportional to 188.38, 282.78 and 139.48 is: 209.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.38 : 282.78 = 139.48 : x
  2. Step 2: Convert to fraction form
    188.38/282.78 = 139.48/x
  3. Step 3: Cross multiply
    188.38x = 282.78 × 139.48
  4. Step 4: Simplify right side
    188.38x = 39,440.04
  5. Step 5: Solve for x
    x = 39,440.04/188.38
  6. Step 6: Final answer
    x = 209.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.