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Finding the Fourth Proportional to 632.01, 872.43 and 399.09

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Solution

The fourth proportional to 632.01, 872.43 and 399.09 is: 550.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.01 : 872.43 = 399.09 : x
  2. Step 2: Convert to fraction form
    632.01/872.43 = 399.09/x
  3. Step 3: Cross multiply
    632.01x = 872.43 × 399.09
  4. Step 4: Simplify right side
    632.01x = 348,178.09
  5. Step 5: Solve for x
    x = 348,178.09/632.01
  6. Step 6: Final answer
    x = 550.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.