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Finding the Fourth Proportional to 72.62, 108.74 and 66.22

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Solution

The fourth proportional to 72.62, 108.74 and 66.22 is: 99.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.62 : 108.74 = 66.22 : x
  2. Step 2: Convert to fraction form
    72.62/108.74 = 66.22/x
  3. Step 3: Cross multiply
    72.62x = 108.74 × 66.22
  4. Step 4: Simplify right side
    72.62x = 7,200.76
  5. Step 5: Solve for x
    x = 7,200.76/72.62
  6. Step 6: Final answer
    x = 99.16

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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.