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Finding the Fourth Proportional to 833.74, 1,250.79 and 285.90

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Solution

The fourth proportional to 833.74, 1,250.79 and 285.90 is: 428.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.74 : 1,250.79 = 285.90 : x
  2. Step 2: Convert to fraction form
    833.74/1,250.79 = 285.90/x
  3. Step 3: Cross multiply
    833.74x = 1,250.79 × 285.90
  4. Step 4: Simplify right side
    833.74x = 357,600.86
  5. Step 5: Solve for x
    x = 357,600.86/833.74
  6. Step 6: Final answer
    x = 428.91

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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.