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Finding the Fourth Proportional to 79.21, 109.29 and 50.14

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Solution

The fourth proportional to 79.21, 109.29 and 50.14 is: 69.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.21 : 109.29 = 50.14 : x
  2. Step 2: Convert to fraction form
    79.21/109.29 = 50.14/x
  3. Step 3: Cross multiply
    79.21x = 109.29 × 50.14
  4. Step 4: Simplify right side
    79.21x = 5,479.80
  5. Step 5: Solve for x
    x = 5,479.80/79.21
  6. Step 6: Final answer
    x = 69.18

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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.