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Finding the Fourth Proportional to 561.81, 843.12 and 399.63

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Solution

The fourth proportional to 561.81, 843.12 and 399.63 is: 599.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.81 : 843.12 = 399.63 : x
  2. Step 2: Convert to fraction form
    561.81/843.12 = 399.63/x
  3. Step 3: Cross multiply
    561.81x = 843.12 × 399.63
  4. Step 4: Simplify right side
    561.81x = 336,936.05
  5. Step 5: Solve for x
    x = 336,936.05/561.81
  6. Step 6: Final answer
    x = 599.73

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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.