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Finding the Fourth Proportional to 208.15, 312.22 and 54.07

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Solution

The fourth proportional to 208.15, 312.22 and 54.07 is: 81.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.15 : 312.22 = 54.07 : x
  2. Step 2: Convert to fraction form
    208.15/312.22 = 54.07/x
  3. Step 3: Cross multiply
    208.15x = 312.22 × 54.07
  4. Step 4: Simplify right side
    208.15x = 16,882.78
  5. Step 5: Solve for x
    x = 16,882.78/208.15
  6. Step 6: Final answer
    x = 81.11

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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.