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Finding the Fourth Proportional to 355.67, 490.73 and 281.76

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Solution

The fourth proportional to 355.67, 490.73 and 281.76 is: 388.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.67 : 490.73 = 281.76 : x
  2. Step 2: Convert to fraction form
    355.67/490.73 = 281.76/x
  3. Step 3: Cross multiply
    355.67x = 490.73 × 281.76
  4. Step 4: Simplify right side
    355.67x = 138,267.60
  5. Step 5: Solve for x
    x = 138,267.60/355.67
  6. Step 6: Final answer
    x = 388.75

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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.