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Finding the Fourth Proportional to 178.41, 246.21 and 100.80

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Solution

The fourth proportional to 178.41, 246.21 and 100.80 is: 139.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.41 : 246.21 = 100.80 : x
  2. Step 2: Convert to fraction form
    178.41/246.21 = 100.80/x
  3. Step 3: Cross multiply
    178.41x = 246.21 × 100.80
  4. Step 4: Simplify right side
    178.41x = 24,817.97
  5. Step 5: Solve for x
    x = 24,817.97/178.41
  6. Step 6: Final answer
    x = 139.11

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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.