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Finding the Fourth Proportional to 207.25, 311.12 and 99.05

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Solution

The fourth proportional to 207.25, 311.12 and 99.05 is: 148.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.25 : 311.12 = 99.05 : x
  2. Step 2: Convert to fraction form
    207.25/311.12 = 99.05/x
  3. Step 3: Cross multiply
    207.25x = 311.12 × 99.05
  4. Step 4: Simplify right side
    207.25x = 30,816.44
  5. Step 5: Solve for x
    x = 30,816.44/207.25
  6. Step 6: Final answer
    x = 148.69

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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.