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Finding the Fourth Proportional to 73.36, 109.20 and 72.90

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Solution

The fourth proportional to 73.36, 109.20 and 72.90 is: 108.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.36 : 109.20 = 72.90 : x
  2. Step 2: Convert to fraction form
    73.36/109.20 = 72.90/x
  3. Step 3: Cross multiply
    73.36x = 109.20 × 72.90
  4. Step 4: Simplify right side
    73.36x = 7,960.54
  5. Step 5: Solve for x
    x = 7,960.54/73.36
  6. Step 6: Final answer
    x = 108.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.