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Finding the Fourth Proportional to 67.21, 92.79 and 45.12

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Solution

The fourth proportional to 67.21, 92.79 and 45.12 is: 62.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 92.79 = 45.12 : x
  2. Step 2: Convert to fraction form
    67.21/92.79 = 45.12/x
  3. Step 3: Cross multiply
    67.21x = 92.79 × 45.12
  4. Step 4: Simplify right side
    67.21x = 4,186.68
  5. Step 5: Solve for x
    x = 4,186.68/67.21
  6. Step 6: Final answer
    x = 62.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.