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Finding the Fourth Proportional to 84.99, 126.96 and 71.33

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Solution

The fourth proportional to 84.99, 126.96 and 71.33 is: 106.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.99 : 126.96 = 71.33 : x
  2. Step 2: Convert to fraction form
    84.99/126.96 = 71.33/x
  3. Step 3: Cross multiply
    84.99x = 126.96 × 71.33
  4. Step 4: Simplify right side
    84.99x = 9,055.42
  5. Step 5: Solve for x
    x = 9,055.42/84.99
  6. Step 6: Final answer
    x = 106.55

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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.