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Finding the Fourth Proportional to 66.82, 99.75 and 61.81

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Solution

The fourth proportional to 66.82, 99.75 and 61.81 is: 92.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.82 : 99.75 = 61.81 : x
  2. Step 2: Convert to fraction form
    66.82/99.75 = 61.81/x
  3. Step 3: Cross multiply
    66.82x = 99.75 × 61.81
  4. Step 4: Simplify right side
    66.82x = 6,165.11
  5. Step 5: Solve for x
    x = 6,165.11/66.82
  6. Step 6: Final answer
    x = 92.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.