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Finding the Fourth Proportional to 208.93, 313.28 and 71.96

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Solution

The fourth proportional to 208.93, 313.28 and 71.96 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.93 : 313.28 = 71.96 : x
  2. Step 2: Convert to fraction form
    208.93/313.28 = 71.96/x
  3. Step 3: Cross multiply
    208.93x = 313.28 × 71.96
  4. Step 4: Simplify right side
    208.93x = 22,543.27
  5. Step 5: Solve for x
    x = 22,543.27/208.93
  6. Step 6: Final answer
    x = 107.90

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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.