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Finding the Fourth Proportional to 85.13, 117.26 and 66.68

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Solution

The fourth proportional to 85.13, 117.26 and 66.68 is: 91.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.13 : 117.26 = 66.68 : x
  2. Step 2: Convert to fraction form
    85.13/117.26 = 66.68/x
  3. Step 3: Cross multiply
    85.13x = 117.26 × 66.68
  4. Step 4: Simplify right side
    85.13x = 7,818.46
  5. Step 5: Solve for x
    x = 7,818.46/85.13
  6. Step 6: Final answer
    x = 91.84

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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.