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Finding the Fourth Proportional to 488.56, 674.28 and 281.56

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Solution

The fourth proportional to 488.56, 674.28 and 281.56 is: 388.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.56 : 674.28 = 281.56 : x
  2. Step 2: Convert to fraction form
    488.56/674.28 = 281.56/x
  3. Step 3: Cross multiply
    488.56x = 674.28 × 281.56
  4. Step 4: Simplify right side
    488.56x = 189,850.28
  5. Step 5: Solve for x
    x = 189,850.28/488.56
  6. Step 6: Final answer
    x = 388.59

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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.