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Finding the Fourth Proportional to 393.94, 543.64 and 219.28

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Solution

The fourth proportional to 393.94, 543.64 and 219.28 is: 302.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.94 : 543.64 = 219.28 : x
  2. Step 2: Convert to fraction form
    393.94/543.64 = 219.28/x
  3. Step 3: Cross multiply
    393.94x = 543.64 × 219.28
  4. Step 4: Simplify right side
    393.94x = 119,209.38
  5. Step 5: Solve for x
    x = 119,209.38/393.94
  6. Step 6: Final answer
    x = 302.61

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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.