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Finding the Fourth Proportional to 99.64, 149.39 and 72.57

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Solution

The fourth proportional to 99.64, 149.39 and 72.57 is: 108.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.64 : 149.39 = 72.57 : x
  2. Step 2: Convert to fraction form
    99.64/149.39 = 72.57/x
  3. Step 3: Cross multiply
    99.64x = 149.39 × 72.57
  4. Step 4: Simplify right side
    99.64x = 10,841.23
  5. Step 5: Solve for x
    x = 10,841.23/99.64
  6. Step 6: Final answer
    x = 108.80

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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.