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Finding the Fourth Proportional to 92.95, 139.58 and 80.19

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Solution

The fourth proportional to 92.95, 139.58 and 80.19 is: 120.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.95 : 139.58 = 80.19 : x
  2. Step 2: Convert to fraction form
    92.95/139.58 = 80.19/x
  3. Step 3: Cross multiply
    92.95x = 139.58 × 80.19
  4. Step 4: Simplify right side
    92.95x = 11,193.34
  5. Step 5: Solve for x
    x = 11,193.34/92.95
  6. Step 6: Final answer
    x = 120.42

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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.