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Finding the Fourth Proportional to 1,249.21, 1,874.55 and 555.91

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Solution

The fourth proportional to 1,249.21, 1,874.55 and 555.91 is: 834.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.21 : 1,874.55 = 555.91 : x
  2. Step 2: Convert to fraction form
    1,249.21/1,874.55 = 555.91/x
  3. Step 3: Cross multiply
    1,249.21x = 1,874.55 × 555.91
  4. Step 4: Simplify right side
    1,249.21x = 1,042,081.09
  5. Step 5: Solve for x
    x = 1,042,081.09/1,249.21
  6. Step 6: Final answer
    x = 834.19

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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.