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Finding the Fourth Proportional to 92.06, 137.99 and 78.43

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Solution

The fourth proportional to 92.06, 137.99 and 78.43 is: 117.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.06 : 137.99 = 78.43 : x
  2. Step 2: Convert to fraction form
    92.06/137.99 = 78.43/x
  3. Step 3: Cross multiply
    92.06x = 137.99 × 78.43
  4. Step 4: Simplify right side
    92.06x = 10,822.41
  5. Step 5: Solve for x
    x = 10,822.41/92.06
  6. Step 6: Final answer
    x = 117.56

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.