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Finding the Fourth Proportional to 137.22, 205.20 and 100.80

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Solution

The fourth proportional to 137.22, 205.20 and 100.80 is: 150.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.22 : 205.20 = 100.80 : x
  2. Step 2: Convert to fraction form
    137.22/205.20 = 100.80/x
  3. Step 3: Cross multiply
    137.22x = 205.20 × 100.80
  4. Step 4: Simplify right side
    137.22x = 20,684.16
  5. Step 5: Solve for x
    x = 20,684.16/137.22
  6. Step 6: Final answer
    x = 150.74

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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.