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Finding the Fourth Proportional to 393.58, 543.13 and 216.54

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Solution

The fourth proportional to 393.58, 543.13 and 216.54 is: 298.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.58 : 543.13 = 216.54 : x
  2. Step 2: Convert to fraction form
    393.58/543.13 = 216.54/x
  3. Step 3: Cross multiply
    393.58x = 543.13 × 216.54
  4. Step 4: Simplify right side
    393.58x = 117,608.83
  5. Step 5: Solve for x
    x = 117,608.83/393.58
  6. Step 6: Final answer
    x = 298.82

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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.