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Finding the Fourth Proportional to 79.65, 109.79 and 63.25

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Solution

The fourth proportional to 79.65, 109.79 and 63.25 is: 87.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.65 : 109.79 = 63.25 : x
  2. Step 2: Convert to fraction form
    79.65/109.79 = 63.25/x
  3. Step 3: Cross multiply
    79.65x = 109.79 × 63.25
  4. Step 4: Simplify right side
    79.65x = 6,944.22
  5. Step 5: Solve for x
    x = 6,944.22/79.65
  6. Step 6: Final answer
    x = 87.18

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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.