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Finding the Fourth Proportional to 66.78, 100.26 and 36.45

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Solution

The fourth proportional to 66.78, 100.26 and 36.45 is: 54.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.78 : 100.26 = 36.45 : x
  2. Step 2: Convert to fraction form
    66.78/100.26 = 36.45/x
  3. Step 3: Cross multiply
    66.78x = 100.26 × 36.45
  4. Step 4: Simplify right side
    66.78x = 3,654.48
  5. Step 5: Solve for x
    x = 3,654.48/66.78
  6. Step 6: Final answer
    x = 54.72

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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.