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Finding the Fourth Proportional to 73.22, 109.76 and 42.80

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Solution

The fourth proportional to 73.22, 109.76 and 42.80 is: 64.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.22 : 109.76 = 42.80 : x
  2. Step 2: Convert to fraction form
    73.22/109.76 = 42.80/x
  3. Step 3: Cross multiply
    73.22x = 109.76 × 42.80
  4. Step 4: Simplify right side
    73.22x = 4,696.97
  5. Step 5: Solve for x
    x = 4,696.97/73.22
  6. Step 6: Final answer
    x = 64.15

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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.