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Finding the Fourth Proportional to 393.84, 542.52 and 328.32

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Solution

The fourth proportional to 393.84, 542.52 and 328.32 is: 452.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.84 : 542.52 = 328.32 : x
  2. Step 2: Convert to fraction form
    393.84/542.52 = 328.32/x
  3. Step 3: Cross multiply
    393.84x = 542.52 × 328.32
  4. Step 4: Simplify right side
    393.84x = 178,120.17
  5. Step 5: Solve for x
    x = 178,120.17/393.84
  6. Step 6: Final answer
    x = 452.27

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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.