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Finding the Fourth Proportional to 92.45, 138.77 and 79.81

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Solution

The fourth proportional to 92.45, 138.77 and 79.81 is: 119.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.45 : 138.77 = 79.81 : x
  2. Step 2: Convert to fraction form
    92.45/138.77 = 79.81/x
  3. Step 3: Cross multiply
    92.45x = 138.77 × 79.81
  4. Step 4: Simplify right side
    92.45x = 11,075.23
  5. Step 5: Solve for x
    x = 11,075.23/92.45
  6. Step 6: Final answer
    x = 119.80

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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.