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Finding the Fourth Proportional to 75.09, 112.60 and 28.80

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Solution

The fourth proportional to 75.09, 112.60 and 28.80 is: 43.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.09 : 112.60 = 28.80 : x
  2. Step 2: Convert to fraction form
    75.09/112.60 = 28.80/x
  3. Step 3: Cross multiply
    75.09x = 112.60 × 28.80
  4. Step 4: Simplify right side
    75.09x = 3,243.11
  5. Step 5: Solve for x
    x = 3,243.11/75.09
  6. Step 6: Final answer
    x = 43.19

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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.