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Finding the Fourth Proportional to 399.48, 552.09 and 301.20

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Solution

The fourth proportional to 399.48, 552.09 and 301.20 is: 416.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.48 : 552.09 = 301.20 : x
  2. Step 2: Convert to fraction form
    399.48/552.09 = 301.20/x
  3. Step 3: Cross multiply
    399.48x = 552.09 × 301.20
  4. Step 4: Simplify right side
    399.48x = 166,289.51
  5. Step 5: Solve for x
    x = 166,289.51/399.48
  6. Step 6: Final answer
    x = 416.26

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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.