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Finding the Fourth Proportional to 392.05, 587.71 and 199.45

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Solution

The fourth proportional to 392.05, 587.71 and 199.45 is: 298.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.05 : 587.71 = 199.45 : x
  2. Step 2: Convert to fraction form
    392.05/587.71 = 199.45/x
  3. Step 3: Cross multiply
    392.05x = 587.71 × 199.45
  4. Step 4: Simplify right side
    392.05x = 117,218.76
  5. Step 5: Solve for x
    x = 117,218.76/392.05
  6. Step 6: Final answer
    x = 298.99

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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.