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Finding the Fourth Proportional to 1,249.32, 1,873.64 and 427.32

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Solution

The fourth proportional to 1,249.32, 1,873.64 and 427.32 is: 640.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.32 : 1,873.64 = 427.32 : x
  2. Step 2: Convert to fraction form
    1,249.32/1,873.64 = 427.32/x
  3. Step 3: Cross multiply
    1,249.32x = 1,873.64 × 427.32
  4. Step 4: Simplify right side
    1,249.32x = 800,644.20
  5. Step 5: Solve for x
    x = 800,644.20/1,249.32
  6. Step 6: Final answer
    x = 640.86

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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.