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Finding the Fourth Proportional to 84.63, 116.85 and 66.17

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Solution

The fourth proportional to 84.63, 116.85 and 66.17 is: 91.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.63 : 116.85 = 66.17 : x
  2. Step 2: Convert to fraction form
    84.63/116.85 = 66.17/x
  3. Step 3: Cross multiply
    84.63x = 116.85 × 66.17
  4. Step 4: Simplify right side
    84.63x = 7,732.26
  5. Step 5: Solve for x
    x = 7,732.26/84.63
  6. Step 6: Final answer
    x = 91.37

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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.