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Finding the Fourth Proportional to 393.52, 543.07 and 218.87

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Solution

The fourth proportional to 393.52, 543.07 and 218.87 is: 302.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.52 : 543.07 = 218.87 : x
  2. Step 2: Convert to fraction form
    393.52/543.07 = 218.87/x
  3. Step 3: Cross multiply
    393.52x = 543.07 × 218.87
  4. Step 4: Simplify right side
    393.52x = 118,861.73
  5. Step 5: Solve for x
    x = 118,861.73/393.52
  6. Step 6: Final answer
    x = 302.05

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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.