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Finding the Fourth Proportional to 92.99, 139.49 and 91.80

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Solution

The fourth proportional to 92.99, 139.49 and 91.80 is: 137.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.99 : 139.49 = 91.80 : x
  2. Step 2: Convert to fraction form
    92.99/139.49 = 91.80/x
  3. Step 3: Cross multiply
    92.99x = 139.49 × 91.80
  4. Step 4: Simplify right side
    92.99x = 12,804.72
  5. Step 5: Solve for x
    x = 12,804.72/92.99
  6. Step 6: Final answer
    x = 137.71

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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.