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Finding the Fourth Proportional to 208.46, 313 and 153.79

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Solution

The fourth proportional to 208.46, 313 and 153.79 is: 230.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.46 : 313 = 153.79 : x
  2. Step 2: Convert to fraction form
    208.46/313 = 153.79/x
  3. Step 3: Cross multiply
    208.46x = 313 × 153.79
  4. Step 4: Simplify right side
    208.46x = 48,136.27
  5. Step 5: Solve for x
    x = 48,136.27/208.46
  6. Step 6: Final answer
    x = 230.91

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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.