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Finding the Fourth Proportional to 311.07, 465.40 and 207.87

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Solution

The fourth proportional to 311.07, 465.40 and 207.87 is: 310.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.07 : 465.40 = 207.87 : x
  2. Step 2: Convert to fraction form
    311.07/465.40 = 207.87/x
  3. Step 3: Cross multiply
    311.07x = 465.40 × 207.87
  4. Step 4: Simplify right side
    311.07x = 96,740.04
  5. Step 5: Solve for x
    x = 96,740.04/311.07
  6. Step 6: Final answer
    x = 310.99

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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.