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Finding the Fourth Proportional to 393.04, 543.09 and 282.88

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Solution

The fourth proportional to 393.04, 543.09 and 282.88 is: 390.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.04 : 543.09 = 282.88 : x
  2. Step 2: Convert to fraction form
    393.04/543.09 = 282.88/x
  3. Step 3: Cross multiply
    393.04x = 543.09 × 282.88
  4. Step 4: Simplify right side
    393.04x = 153,629.30
  5. Step 5: Solve for x
    x = 153,629.30/393.04
  6. Step 6: Final answer
    x = 390.87

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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.