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Finding the Fourth Proportional to 393.01, 542.18 and 245.39

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Solution

The fourth proportional to 393.01, 542.18 and 245.39 is: 338.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.01 : 542.18 = 245.39 : x
  2. Step 2: Convert to fraction form
    393.01/542.18 = 245.39/x
  3. Step 3: Cross multiply
    393.01x = 542.18 × 245.39
  4. Step 4: Simplify right side
    393.01x = 133,043.45
  5. Step 5: Solve for x
    x = 133,043.45/393.01
  6. Step 6: Final answer
    x = 338.53

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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.