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Finding the Fourth Proportional to 833.78, 1,249.89 and 285.59

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Solution

The fourth proportional to 833.78, 1,249.89 and 285.59 is: 428.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.78 : 1,249.89 = 285.59 : x
  2. Step 2: Convert to fraction form
    833.78/1,249.89 = 285.59/x
  3. Step 3: Cross multiply
    833.78x = 1,249.89 × 285.59
  4. Step 4: Simplify right side
    833.78x = 356,956.09
  5. Step 5: Solve for x
    x = 356,956.09/833.78
  6. Step 6: Final answer
    x = 428.12

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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.