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Finding the Fourth Proportional to 67.92, 94.22 and 64.58

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Solution

The fourth proportional to 67.92, 94.22 and 64.58 is: 89.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 94.22 = 64.58 : x
  2. Step 2: Convert to fraction form
    67.92/94.22 = 64.58/x
  3. Step 3: Cross multiply
    67.92x = 94.22 × 64.58
  4. Step 4: Simplify right side
    67.92x = 6,083.93
  5. Step 5: Solve for x
    x = 6,083.93/67.92
  6. Step 6: Final answer
    x = 89.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.