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Finding the Fourth Proportional to 404.28, 556.92 and 389.88

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Solution

The fourth proportional to 404.28, 556.92 and 389.88 is: 537.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.28 : 556.92 = 389.88 : x
  2. Step 2: Convert to fraction form
    404.28/556.92 = 389.88/x
  3. Step 3: Cross multiply
    404.28x = 556.92 × 389.88
  4. Step 4: Simplify right side
    404.28x = 217,131.97
  5. Step 5: Solve for x
    x = 217,131.97/404.28
  6. Step 6: Final answer
    x = 537.08

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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.