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Finding the Fourth Proportional to 865.25, 1,297.88 and 280.74

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Solution

The fourth proportional to 865.25, 1,297.88 and 280.74 is: 421.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.25 : 1,297.88 = 280.74 : x
  2. Step 2: Convert to fraction form
    865.25/1,297.88 = 280.74/x
  3. Step 3: Cross multiply
    865.25x = 1,297.88 × 280.74
  4. Step 4: Simplify right side
    865.25x = 364,365.43
  5. Step 5: Solve for x
    x = 364,365.43/865.25
  6. Step 6: Final answer
    x = 421.11

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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.