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Finding the Fourth Proportional to 208.49, 312.56 and 122.81

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Solution

The fourth proportional to 208.49, 312.56 and 122.81 is: 184.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.49 : 312.56 = 122.81 : x
  2. Step 2: Convert to fraction form
    208.49/312.56 = 122.81/x
  3. Step 3: Cross multiply
    208.49x = 312.56 × 122.81
  4. Step 4: Simplify right side
    208.49x = 38,385.49
  5. Step 5: Solve for x
    x = 38,385.49/208.49
  6. Step 6: Final answer
    x = 184.11

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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.