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Finding the Fourth Proportional to 208.15, 312.22 and 63.87

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Solution

The fourth proportional to 208.15, 312.22 and 63.87 is: 95.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.15 : 312.22 = 63.87 : x
  2. Step 2: Convert to fraction form
    208.15/312.22 = 63.87/x
  3. Step 3: Cross multiply
    208.15x = 312.22 × 63.87
  4. Step 4: Simplify right side
    208.15x = 19,939.93
  5. Step 5: Solve for x
    x = 19,939.93/208.15
  6. Step 6: Final answer
    x = 95.80

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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.