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Finding the Fourth Proportional to 393.09, 542.37 and 225.06

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Solution

The fourth proportional to 393.09, 542.37 and 225.06 is: 310.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.09 : 542.37 = 225.06 : x
  2. Step 2: Convert to fraction form
    393.09/542.37 = 225.06/x
  3. Step 3: Cross multiply
    393.09x = 542.37 × 225.06
  4. Step 4: Simplify right side
    393.09x = 122,065.79
  5. Step 5: Solve for x
    x = 122,065.79/393.09
  6. Step 6: Final answer
    x = 310.53

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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.