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Finding the Fourth Proportional to 208.72, 313.08 and 71.77

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Solution

The fourth proportional to 208.72, 313.08 and 71.77 is: 107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.72 : 313.08 = 71.77 : x
  2. Step 2: Convert to fraction form
    208.72/313.08 = 71.77/x
  3. Step 3: Cross multiply
    208.72x = 313.08 × 71.77
  4. Step 4: Simplify right side
    208.72x = 22,469.93
  5. Step 5: Solve for x
    x = 22,469.93/208.72
  6. Step 6: Final answer
    x = 107.65

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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.