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Finding the Fourth Proportional to 393.62, 543.20 and 218.95

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Solution

The fourth proportional to 393.62, 543.20 and 218.95 is: 302.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.62 : 543.20 = 218.95 : x
  2. Step 2: Convert to fraction form
    393.62/543.20 = 218.95/x
  3. Step 3: Cross multiply
    393.62x = 543.20 × 218.95
  4. Step 4: Simplify right side
    393.62x = 118,931.19
  5. Step 5: Solve for x
    x = 118,931.19/393.62
  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.