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Finding the Fourth Proportional to 66.11, 99.11 and 39.03

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Solution

The fourth proportional to 66.11, 99.11 and 39.03 is: 58.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.11 : 99.11 = 39.03 : x
  2. Step 2: Convert to fraction form
    66.11/99.11 = 39.03/x
  3. Step 3: Cross multiply
    66.11x = 99.11 × 39.03
  4. Step 4: Simplify right side
    66.11x = 3,867.99
  5. Step 5: Solve for x
    x = 3,867.99/66.11
  6. Step 6: Final answer
    x = 58.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.