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Finding the Fourth Proportional to 487.86, 731.79 and 199.09

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Solution

The fourth proportional to 487.86, 731.79 and 199.09 is: 298.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.86 : 731.79 = 199.09 : x
  2. Step 2: Convert to fraction form
    487.86/731.79 = 199.09/x
  3. Step 3: Cross multiply
    487.86x = 731.79 × 199.09
  4. Step 4: Simplify right side
    487.86x = 145,692.07
  5. Step 5: Solve for x
    x = 145,692.07/487.86
  6. Step 6: Final answer
    x = 298.64

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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.