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Finding the Fourth Proportional to 833.75, 1,249.31 and 486.21

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Solution

The fourth proportional to 833.75, 1,249.31 and 486.21 is: 728.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.75 : 1,249.31 = 486.21 : x
  2. Step 2: Convert to fraction form
    833.75/1,249.31 = 486.21/x
  3. Step 3: Cross multiply
    833.75x = 1,249.31 × 486.21
  4. Step 4: Simplify right side
    833.75x = 607,427.02
  5. Step 5: Solve for x
    x = 607,427.02/833.75
  6. Step 6: Final answer
    x = 728.55

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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.