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Finding the Fourth Proportional to 137.76, 206.36 and 91.86

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Solution

The fourth proportional to 137.76, 206.36 and 91.86 is: 137.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.76 : 206.36 = 91.86 : x
  2. Step 2: Convert to fraction form
    137.76/206.36 = 91.86/x
  3. Step 3: Cross multiply
    137.76x = 206.36 × 91.86
  4. Step 4: Simplify right side
    137.76x = 18,956.23
  5. Step 5: Solve for x
    x = 18,956.23/137.76
  6. Step 6: Final answer
    x = 137.60

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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.