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Finding the Fourth Proportional to 68.12, 94.02 and 39.02

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Solution

The fourth proportional to 68.12, 94.02 and 39.02 is: 53.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.12 : 94.02 = 39.02 : x
  2. Step 2: Convert to fraction form
    68.12/94.02 = 39.02/x
  3. Step 3: Cross multiply
    68.12x = 94.02 × 39.02
  4. Step 4: Simplify right side
    68.12x = 3,668.66
  5. Step 5: Solve for x
    x = 3,668.66/68.12
  6. Step 6: Final answer
    x = 53.86

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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.