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Finding the Fourth Proportional to 72.30, 108.37 and 54.30

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Solution

The fourth proportional to 72.30, 108.37 and 54.30 is: 81.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.30 : 108.37 = 54.30 : x
  2. Step 2: Convert to fraction form
    72.30/108.37 = 54.30/x
  3. Step 3: Cross multiply
    72.30x = 108.37 × 54.30
  4. Step 4: Simplify right side
    72.30x = 5,884.49
  5. Step 5: Solve for x
    x = 5,884.49/72.30
  6. Step 6: Final answer
    x = 81.39

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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.