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Finding the Fourth Proportional to 207.65, 311.30 and 79.31

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Solution

The fourth proportional to 207.65, 311.30 and 79.31 is: 118.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.65 : 311.30 = 79.31 : x
  2. Step 2: Convert to fraction form
    207.65/311.30 = 79.31/x
  3. Step 3: Cross multiply
    207.65x = 311.30 × 79.31
  4. Step 4: Simplify right side
    207.65x = 24,689.88
  5. Step 5: Solve for x
    x = 24,689.88/207.65
  6. Step 6: Final answer
    x = 118.90

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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.