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Finding the Fourth Proportional to 72.85, 109.27 and 18.75

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Solution

The fourth proportional to 72.85, 109.27 and 18.75 is: 28.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.85 : 109.27 = 18.75 : x
  2. Step 2: Convert to fraction form
    72.85/109.27 = 18.75/x
  3. Step 3: Cross multiply
    72.85x = 109.27 × 18.75
  4. Step 4: Simplify right side
    72.85x = 2,048.22
  5. Step 5: Solve for x
    x = 2,048.22/72.85
  6. Step 6: Final answer
    x = 28.11

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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.