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Finding the Fourth Proportional to 823.98, 1,235.16 and 391.44

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Solution

The fourth proportional to 823.98, 1,235.16 and 391.44 is: 586.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.98 : 1,235.16 = 391.44 : x
  2. Step 2: Convert to fraction form
    823.98/1,235.16 = 391.44/x
  3. Step 3: Cross multiply
    823.98x = 1,235.16 × 391.44
  4. Step 4: Simplify right side
    823.98x = 483,491.03
  5. Step 5: Solve for x
    x = 483,491.03/823.98
  6. Step 6: Final answer
    x = 586.78

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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.