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Finding the Fourth Proportional to 72.45, 108.47 and 54.50

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Solution

The fourth proportional to 72.45, 108.47 and 54.50 is: 81.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.45 : 108.47 = 54.50 : x
  2. Step 2: Convert to fraction form
    72.45/108.47 = 54.50/x
  3. Step 3: Cross multiply
    72.45x = 108.47 × 54.50
  4. Step 4: Simplify right side
    72.45x = 5,911.62
  5. Step 5: Solve for x
    x = 5,911.62/72.45
  6. Step 6: Final answer
    x = 81.60

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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.