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Finding the Fourth Proportional to 68.72, 94.65 and 61.79

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Solution

The fourth proportional to 68.72, 94.65 and 61.79 is: 85.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.72 : 94.65 = 61.79 : x
  2. Step 2: Convert to fraction form
    68.72/94.65 = 61.79/x
  3. Step 3: Cross multiply
    68.72x = 94.65 × 61.79
  4. Step 4: Simplify right side
    68.72x = 5,848.42
  5. Step 5: Solve for x
    x = 5,848.42/68.72
  6. Step 6: Final answer
    x = 85.11

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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.