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Finding the Fourth Proportional to 208.75, 312.56 and 196.30

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Solution

The fourth proportional to 208.75, 312.56 and 196.30 is: 293.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.75 : 312.56 = 196.30 : x
  2. Step 2: Convert to fraction form
    208.75/312.56 = 196.30/x
  3. Step 3: Cross multiply
    208.75x = 312.56 × 196.30
  4. Step 4: Simplify right side
    208.75x = 61,354.79
  5. Step 5: Solve for x
    x = 61,354.79/208.75
  6. Step 6: Final answer
    x = 293.91

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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.