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Finding the Fourth Proportional to 85.23, 126.93 and 84.28

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Solution

The fourth proportional to 85.23, 126.93 and 84.28 is: 125.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.23 : 126.93 = 84.28 : x
  2. Step 2: Convert to fraction form
    85.23/126.93 = 84.28/x
  3. Step 3: Cross multiply
    85.23x = 126.93 × 84.28
  4. Step 4: Simplify right side
    85.23x = 10,697.66
  5. Step 5: Solve for x
    x = 10,697.66/85.23
  6. Step 6: Final answer
    x = 125.52

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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.