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Finding the Fourth Proportional to 208.86, 313.29 and 80.64

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Solution

The fourth proportional to 208.86, 313.29 and 80.64 is: 120.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.86 : 313.29 = 80.64 : x
  2. Step 2: Convert to fraction form
    208.86/313.29 = 80.64/x
  3. Step 3: Cross multiply
    208.86x = 313.29 × 80.64
  4. Step 4: Simplify right side
    208.86x = 25,263.71
  5. Step 5: Solve for x
    x = 25,263.71/208.86
  6. Step 6: Final answer
    x = 120.96

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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.