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Finding the Fourth Proportional to 79.27, 109.32 and 63.63

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Solution

The fourth proportional to 79.27, 109.32 and 63.63 is: 87.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.27 : 109.32 = 63.63 : x
  2. Step 2: Convert to fraction form
    79.27/109.32 = 63.63/x
  3. Step 3: Cross multiply
    79.27x = 109.32 × 63.63
  4. Step 4: Simplify right side
    79.27x = 6,956.03
  5. Step 5: Solve for x
    x = 6,956.03/79.27
  6. Step 6: Final answer
    x = 87.75

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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.