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Finding the Fourth Proportional to 538.78, 806.70 and 281.74

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Solution

The fourth proportional to 538.78, 806.70 and 281.74 is: 421.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.78 : 806.70 = 281.74 : x
  2. Step 2: Convert to fraction form
    538.78/806.70 = 281.74/x
  3. Step 3: Cross multiply
    538.78x = 806.70 × 281.74
  4. Step 4: Simplify right side
    538.78x = 227,279.66
  5. Step 5: Solve for x
    x = 227,279.66/538.78
  6. Step 6: Final answer
    x = 421.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.