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Finding the Fourth Proportional to 75.81, 104.72 and 66.63

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Solution

The fourth proportional to 75.81, 104.72 and 66.63 is: 92.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.81 : 104.72 = 66.63 : x
  2. Step 2: Convert to fraction form
    75.81/104.72 = 66.63/x
  3. Step 3: Cross multiply
    75.81x = 104.72 × 66.63
  4. Step 4: Simplify right side
    75.81x = 6,977.16
  5. Step 5: Solve for x
    x = 6,977.16/75.81
  6. Step 6: Final answer
    x = 92.03

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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.