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Finding the Fourth Proportional to 109.76, 164.43 and 48.79

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Solution

The fourth proportional to 109.76, 164.43 and 48.79 is: 73.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.76 : 164.43 = 48.79 : x
  2. Step 2: Convert to fraction form
    109.76/164.43 = 48.79/x
  3. Step 3: Cross multiply
    109.76x = 164.43 × 48.79
  4. Step 4: Simplify right side
    109.76x = 8,022.13
  5. Step 5: Solve for x
    x = 8,022.13/109.76
  6. Step 6: Final answer
    x = 73.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.