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Finding the Fourth Proportional to 393.44, 542.72 and 238.08

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Solution

The fourth proportional to 393.44, 542.72 and 238.08 is: 328.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.44 : 542.72 = 238.08 : x
  2. Step 2: Convert to fraction form
    393.44/542.72 = 238.08/x
  3. Step 3: Cross multiply
    393.44x = 542.72 × 238.08
  4. Step 4: Simplify right side
    393.44x = 129,210.78
  5. Step 5: Solve for x
    x = 129,210.78/393.44
  6. Step 6: Final answer
    x = 328.41

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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.