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Finding the Fourth Proportional to 85.22, 126.93 and 84.15

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Solution

The fourth proportional to 85.22, 126.93 and 84.15 is: 125.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.22 : 126.93 = 84.15 : x
  2. Step 2: Convert to fraction form
    85.22/126.93 = 84.15/x
  3. Step 3: Cross multiply
    85.22x = 126.93 × 84.15
  4. Step 4: Simplify right side
    85.22x = 10,681.16
  5. Step 5: Solve for x
    x = 10,681.16/85.22
  6. Step 6: Final answer
    x = 125.34

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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.