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Finding the Fourth Proportional to 66.96, 100.20 and 55.56

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Solution

The fourth proportional to 66.96, 100.20 and 55.56 is: 83.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.96 : 100.20 = 55.56 : x
  2. Step 2: Convert to fraction form
    66.96/100.20 = 55.56/x
  3. Step 3: Cross multiply
    66.96x = 100.20 × 55.56
  4. Step 4: Simplify right side
    66.96x = 5,567.11
  5. Step 5: Solve for x
    x = 5,567.11/66.96
  6. Step 6: Final answer
    x = 83.14

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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.