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Finding the Fourth Proportional to 66.67, 100.00 and 37.78

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Solution

The fourth proportional to 66.67, 100.00 and 37.78 is: 56.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.67 : 100.00 = 37.78 : x
  2. Step 2: Convert to fraction form
    66.67/100.00 = 37.78/x
  3. Step 3: Cross multiply
    66.67x = 100.00 × 37.78
  4. Step 4: Simplify right side
    66.67x = 3,777.41
  5. Step 5: Solve for x
    x = 3,777.41/66.67
  6. Step 6: Final answer
    x = 56.66

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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.