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Finding the Fourth Proportional to 73.66, 100.96 and 72.70

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Solution

The fourth proportional to 73.66, 100.96 and 72.70 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.66 : 100.96 = 72.70 : x
  2. Step 2: Convert to fraction form
    73.66/100.96 = 72.70/x
  3. Step 3: Cross multiply
    73.66x = 100.96 × 72.70
  4. Step 4: Simplify right side
    73.66x = 7,339.43
  5. Step 5: Solve for x
    x = 7,339.43/73.66
  6. Step 6: Final answer
    x = 99.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.