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Finding the Fourth Proportional to 207.99, 312.18 and 99.86

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Solution

The fourth proportional to 207.99, 312.18 and 99.86 is: 149.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.99 : 312.18 = 99.86 : x
  2. Step 2: Convert to fraction form
    207.99/312.18 = 99.86/x
  3. Step 3: Cross multiply
    207.99x = 312.18 × 99.86
  4. Step 4: Simplify right side
    207.99x = 31,172.73
  5. Step 5: Solve for x
    x = 31,172.73/207.99
  6. Step 6: Final answer
    x = 149.88

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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.