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Finding the Fourth Proportional to 84.76, 116.85 and 66.31

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Solution

The fourth proportional to 84.76, 116.85 and 66.31 is: 91.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.76 : 116.85 = 66.31 : x
  2. Step 2: Convert to fraction form
    84.76/116.85 = 66.31/x
  3. Step 3: Cross multiply
    84.76x = 116.85 × 66.31
  4. Step 4: Simplify right side
    84.76x = 7,748.32
  5. Step 5: Solve for x
    x = 7,748.32/84.76
  6. Step 6: Final answer
    x = 91.41

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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.