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Finding the Fourth Proportional to 399.06, 547.02 and 393.39

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Solution

The fourth proportional to 399.06, 547.02 and 393.39 is: 539.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.06 : 547.02 = 393.39 : x
  2. Step 2: Convert to fraction form
    399.06/547.02 = 393.39/x
  3. Step 3: Cross multiply
    399.06x = 547.02 × 393.39
  4. Step 4: Simplify right side
    399.06x = 215,192.20
  5. Step 5: Solve for x
    x = 215,192.20/399.06
  6. Step 6: Final answer
    x = 539.25

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.