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Finding the Fourth Proportional to 208.62, 312.89 and 71.66

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Solution

The fourth proportional to 208.62, 312.89 and 71.66 is: 107.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.62 : 312.89 = 71.66 : x
  2. Step 2: Convert to fraction form
    208.62/312.89 = 71.66/x
  3. Step 3: Cross multiply
    208.62x = 312.89 × 71.66
  4. Step 4: Simplify right side
    208.62x = 22,421.70
  5. Step 5: Solve for x
    x = 22,421.70/208.62
  6. Step 6: Final answer
    x = 107.48

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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.