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Finding the Fourth Proportional to 85.09, 126.87 and 79.93

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Solution

The fourth proportional to 85.09, 126.87 and 79.93 is: 119.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.09 : 126.87 = 79.93 : x
  2. Step 2: Convert to fraction form
    85.09/126.87 = 79.93/x
  3. Step 3: Cross multiply
    85.09x = 126.87 × 79.93
  4. Step 4: Simplify right side
    85.09x = 10,140.72
  5. Step 5: Solve for x
    x = 10,140.72/85.09
  6. Step 6: Final answer
    x = 119.18

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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.