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Finding the Fourth Proportional to 208.66, 313.02 and 69.79

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Solution

The fourth proportional to 208.66, 313.02 and 69.79 is: 104.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.66 : 313.02 = 69.79 : x
  2. Step 2: Convert to fraction form
    208.66/313.02 = 69.79/x
  3. Step 3: Cross multiply
    208.66x = 313.02 × 69.79
  4. Step 4: Simplify right side
    208.66x = 21,846.55
  5. Step 5: Solve for x
    x = 21,846.55/208.66
  6. Step 6: Final answer
    x = 104.70

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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.