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Finding the Fourth Proportional to 393.56, 543.12 and 218.95

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Solution

The fourth proportional to 393.56, 543.12 and 218.95 is: 302.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.56 : 543.12 = 218.95 : x
  2. Step 2: Convert to fraction form
    393.56/543.12 = 218.95/x
  3. Step 3: Cross multiply
    393.56x = 543.12 × 218.95
  4. Step 4: Simplify right side
    393.56x = 118,913.95
  5. Step 5: Solve for x
    x = 118,913.95/393.56
  6. Step 6: Final answer
    x = 302.15

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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.