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Finding the Fourth Proportional to 822.40, 1,234.30 and 335.80

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Solution

The fourth proportional to 822.40, 1,234.30 and 335.80 is: 503.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.40 : 1,234.30 = 335.80 : x
  2. Step 2: Convert to fraction form
    822.40/1,234.30 = 335.80/x
  3. Step 3: Cross multiply
    822.40x = 1,234.30 × 335.80
  4. Step 4: Simplify right side
    822.40x = 414,477.94
  5. Step 5: Solve for x
    x = 414,477.94/822.40
  6. Step 6: Final answer
    x = 503.99

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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.