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Finding the Fourth Proportional to 68.72, 94.79 and 63.32

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Solution

The fourth proportional to 68.72, 94.79 and 63.32 is: 87.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.72 : 94.79 = 63.32 : x
  2. Step 2: Convert to fraction form
    68.72/94.79 = 63.32/x
  3. Step 3: Cross multiply
    68.72x = 94.79 × 63.32
  4. Step 4: Simplify right side
    68.72x = 6,001.79
  5. Step 5: Solve for x
    x = 6,001.79/68.72
  6. Step 6: Final answer
    x = 87.34

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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.