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Finding the Fourth Proportional to 187.78, 281.70 and 106.68

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Solution

The fourth proportional to 187.78, 281.70 and 106.68 is: 160.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.78 : 281.70 = 106.68 : x
  2. Step 2: Convert to fraction form
    187.78/281.70 = 106.68/x
  3. Step 3: Cross multiply
    187.78x = 281.70 × 106.68
  4. Step 4: Simplify right side
    187.78x = 30,051.76
  5. Step 5: Solve for x
    x = 30,051.76/187.78
  6. Step 6: Final answer
    x = 160.04

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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.