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Finding the Fourth Proportional to 85, 117.42 and 67.45

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Solution

The fourth proportional to 85, 117.42 and 67.45 is: 93.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 117.42 = 67.45 : x
  2. Step 2: Convert to fraction form
    85/117.42 = 67.45/x
  3. Step 3: Cross multiply
    85x = 117.42 × 67.45
  4. Step 4: Simplify right side
    85x = 7,919.98
  5. Step 5: Solve for x
    x = 7,919.98/85
  6. Step 6: Final answer
    x = 93.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.