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Finding the Fourth Proportional to 393.55, 543.11 and 218.90

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Solution

The fourth proportional to 393.55, 543.11 and 218.90 is: 302.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.55 : 543.11 = 218.90 : x
  2. Step 2: Convert to fraction form
    393.55/543.11 = 218.90/x
  3. Step 3: Cross multiply
    393.55x = 543.11 × 218.90
  4. Step 4: Simplify right side
    393.55x = 118,887.04
  5. Step 5: Solve for x
    x = 118,887.04/393.55
  6. Step 6: Final answer
    x = 302.09

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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.