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Finding the Fourth Proportional to 1,249.69, 1,874.78 and 372.21

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Solution

The fourth proportional to 1,249.69, 1,874.78 and 372.21 is: 558.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.69 : 1,874.78 = 372.21 : x
  2. Step 2: Convert to fraction form
    1,249.69/1,874.78 = 372.21/x
  3. Step 3: Cross multiply
    1,249.69x = 1,874.78 × 372.21
  4. Step 4: Simplify right side
    1,249.69x = 697,811.86
  5. Step 5: Solve for x
    x = 697,811.86/1,249.69
  6. Step 6: Final answer
    x = 558.39

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Double scale
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1.5x scale

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.