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Finding the Fourth Proportional to 79.21, 118.23 and 75.25

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Solution

The fourth proportional to 79.21, 118.23 and 75.25 is: 112.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.21 : 118.23 = 75.25 : x
  2. Step 2: Convert to fraction form
    79.21/118.23 = 75.25/x
  3. Step 3: Cross multiply
    79.21x = 118.23 × 75.25
  4. Step 4: Simplify right side
    79.21x = 8,896.22
  5. Step 5: Solve for x
    x = 8,896.22/79.21
  6. Step 6: Final answer
    x = 112.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.