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Finding the Fourth Proportional to 90.82, 125.30 and 61.66

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Solution

The fourth proportional to 90.82, 125.30 and 61.66 is: 85.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.82 : 125.30 = 61.66 : x
  2. Step 2: Convert to fraction form
    90.82/125.30 = 61.66/x
  3. Step 3: Cross multiply
    90.82x = 125.30 × 61.66
  4. Step 4: Simplify right side
    90.82x = 7,725.06
  5. Step 5: Solve for x
    x = 7,725.06/90.82
  6. Step 6: Final answer
    x = 85.06

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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.