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Finding the Fourth Proportional to 355.49, 490.61 and 282.41

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Solution

The fourth proportional to 355.49, 490.61 and 282.41 is: 389.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.49 : 490.61 = 282.41 : x
  2. Step 2: Convert to fraction form
    355.49/490.61 = 282.41/x
  3. Step 3: Cross multiply
    355.49x = 490.61 × 282.41
  4. Step 4: Simplify right side
    355.49x = 138,551.76
  5. Step 5: Solve for x
    x = 138,551.76/355.49
  6. Step 6: Final answer
    x = 389.75

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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.