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Finding the Fourth Proportional to 72.06, 108.12 and 28.75

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Solution

The fourth proportional to 72.06, 108.12 and 28.75 is: 43.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.06 : 108.12 = 28.75 : x
  2. Step 2: Convert to fraction form
    72.06/108.12 = 28.75/x
  3. Step 3: Cross multiply
    72.06x = 108.12 × 28.75
  4. Step 4: Simplify right side
    72.06x = 3,108.59
  5. Step 5: Solve for x
    x = 3,108.59/72.06
  6. Step 6: Final answer
    x = 43.14

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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.