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Finding the Fourth Proportional to 287.70, 431.39 and 196.50

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Solution

The fourth proportional to 287.70, 431.39 and 196.50 is: 294.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.70 : 431.39 = 196.50 : x
  2. Step 2: Convert to fraction form
    287.70/431.39 = 196.50/x
  3. Step 3: Cross multiply
    287.70x = 431.39 × 196.50
  4. Step 4: Simplify right side
    287.70x = 84,768.14
  5. Step 5: Solve for x
    x = 84,768.14/287.70
  6. Step 6: Final answer
    x = 294.64

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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.