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Finding the Fourth Proportional to 208.61, 313.12 and 153.09

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Solution

The fourth proportional to 208.61, 313.12 and 153.09 is: 229.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.61 : 313.12 = 153.09 : x
  2. Step 2: Convert to fraction form
    208.61/313.12 = 153.09/x
  3. Step 3: Cross multiply
    208.61x = 313.12 × 153.09
  4. Step 4: Simplify right side
    208.61x = 47,934.87
  5. Step 5: Solve for x
    x = 47,934.87/208.61
  6. Step 6: Final answer
    x = 229.78

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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.