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Finding the Fourth Proportional to 66.09, 99.05 and 38.98

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Solution

The fourth proportional to 66.09, 99.05 and 38.98 is: 58.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.09 : 99.05 = 38.98 : x
  2. Step 2: Convert to fraction form
    66.09/99.05 = 38.98/x
  3. Step 3: Cross multiply
    66.09x = 99.05 × 38.98
  4. Step 4: Simplify right side
    66.09x = 3,861.01
  5. Step 5: Solve for x
    x = 3,861.01/66.09
  6. Step 6: Final answer
    x = 58.42

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