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Finding the Fourth Proportional to 823.94, 1,236.34 and 579.98

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Solution

The fourth proportional to 823.94, 1,236.34 and 579.98 is: 870.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.94 : 1,236.34 = 579.98 : x
  2. Step 2: Convert to fraction form
    823.94/1,236.34 = 579.98/x
  3. Step 3: Cross multiply
    823.94x = 1,236.34 × 579.98
  4. Step 4: Simplify right side
    823.94x = 717,052.47
  5. Step 5: Solve for x
    x = 717,052.47/823.94
  6. Step 6: Final answer
    x = 870.27

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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.