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Finding the Fourth Proportional to 393.13, 542.12 and 318.37

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Solution

The fourth proportional to 393.13, 542.12 and 318.37 is: 439.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.13 : 542.12 = 318.37 : x
  2. Step 2: Convert to fraction form
    393.13/542.12 = 318.37/x
  3. Step 3: Cross multiply
    393.13x = 542.12 × 318.37
  4. Step 4: Simplify right side
    393.13x = 172,594.74
  5. Step 5: Solve for x
    x = 172,594.74/393.13
  6. Step 6: Final answer
    x = 439.03

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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.