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Finding the Fourth Proportional to 66.96, 100.40 and 45.43

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Solution

The fourth proportional to 66.96, 100.40 and 45.43 is: 68.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.96 : 100.40 = 45.43 : x
  2. Step 2: Convert to fraction form
    66.96/100.40 = 45.43/x
  3. Step 3: Cross multiply
    66.96x = 100.40 × 45.43
  4. Step 4: Simplify right side
    66.96x = 4,560.69
  5. Step 5: Solve for x
    x = 4,560.69/66.96
  6. Step 6: Final answer
    x = 68.11

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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.