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Finding the Fourth Proportional to 287.66, 431.69 and 196.44

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Solution

The fourth proportional to 287.66, 431.69 and 196.44 is: 294.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.66 : 431.69 = 196.44 : x
  2. Step 2: Convert to fraction form
    287.66/431.69 = 196.44/x
  3. Step 3: Cross multiply
    287.66x = 431.69 × 196.44
  4. Step 4: Simplify right side
    287.66x = 84,800.20
  5. Step 5: Solve for x
    x = 84,800.20/287.66
  6. Step 6: Final answer
    x = 294.80

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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.