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Finding the Fourth Proportional to 834.53, 1,249.49 and 421.65

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Solution

The fourth proportional to 834.53, 1,249.49 and 421.65 is: 631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.53 : 1,249.49 = 421.65 : x
  2. Step 2: Convert to fraction form
    834.53/1,249.49 = 421.65/x
  3. Step 3: Cross multiply
    834.53x = 1,249.49 × 421.65
  4. Step 4: Simplify right side
    834.53x = 526,845.35
  5. Step 5: Solve for x
    x = 526,845.35/834.53
  6. Step 6: Final answer
    x = 631.31

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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.