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Finding the Fourth Proportional to 1,249.47, 1,872.90 and 427.46

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Solution

The fourth proportional to 1,249.47, 1,872.90 and 427.46 is: 640.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.47 : 1,872.90 = 427.46 : x
  2. Step 2: Convert to fraction form
    1,249.47/1,872.90 = 427.46/x
  3. Step 3: Cross multiply
    1,249.47x = 1,872.90 × 427.46
  4. Step 4: Simplify right side
    1,249.47x = 800,580.47
  5. Step 5: Solve for x
    x = 800,580.47/1,249.47
  6. Step 6: Final answer
    x = 640.74

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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.