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Finding the Fourth Proportional to 85.02, 126.92 and 80.34

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Solution

The fourth proportional to 85.02, 126.92 and 80.34 is: 119.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.02 : 126.92 = 80.34 : x
  2. Step 2: Convert to fraction form
    85.02/126.92 = 80.34/x
  3. Step 3: Cross multiply
    85.02x = 126.92 × 80.34
  4. Step 4: Simplify right side
    85.02x = 10,196.75
  5. Step 5: Solve for x
    x = 10,196.75/85.02
  6. Step 6: Final answer
    x = 119.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.