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Finding the Fourth Proportional to 188.07, 281.72 and 139.47

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Solution

The fourth proportional to 188.07, 281.72 and 139.47 is: 208.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.07 : 281.72 = 139.47 : x
  2. Step 2: Convert to fraction form
    188.07/281.72 = 139.47/x
  3. Step 3: Cross multiply
    188.07x = 281.72 × 139.47
  4. Step 4: Simplify right side
    188.07x = 39,291.49
  5. Step 5: Solve for x
    x = 39,291.49/188.07
  6. Step 6: Final answer
    x = 208.92

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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.