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Finding the Fourth Proportional to 207.81, 312.03 and 191.61

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Solution

The fourth proportional to 207.81, 312.03 and 191.61 is: 287.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 312.03 = 191.61 : x
  2. Step 2: Convert to fraction form
    207.81/312.03 = 191.61/x
  3. Step 3: Cross multiply
    207.81x = 312.03 × 191.61
  4. Step 4: Simplify right side
    207.81x = 59,788.07
  5. Step 5: Solve for x
    x = 59,788.07/207.81
  6. Step 6: Final answer
    x = 287.71

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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.