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Finding the Fourth Proportional to 85.31, 117.60 and 66.83

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Solution

The fourth proportional to 85.31, 117.60 and 66.83 is: 92.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.31 : 117.60 = 66.83 : x
  2. Step 2: Convert to fraction form
    85.31/117.60 = 66.83/x
  3. Step 3: Cross multiply
    85.31x = 117.60 × 66.83
  4. Step 4: Simplify right side
    85.31x = 7,859.21
  5. Step 5: Solve for x
    x = 7,859.21/85.31
  6. Step 6: Final answer
    x = 92.13

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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.