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Finding the Fourth Proportional to 393.65, 543.24 and 218.99

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Solution

The fourth proportional to 393.65, 543.24 and 218.99 is: 302.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.65 : 543.24 = 218.99 : x
  2. Step 2: Convert to fraction form
    393.65/543.24 = 218.99/x
  3. Step 3: Cross multiply
    393.65x = 543.24 × 218.99
  4. Step 4: Simplify right side
    393.65x = 118,965.34
  5. Step 5: Solve for x
    x = 118,965.34/393.65
  6. Step 6: Final answer
    x = 302.21

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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.