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Finding the Fourth Proportional to 822.67, 1,234.50 and 389.86

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Solution

The fourth proportional to 822.67, 1,234.50 and 389.86 is: 585.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.67 : 1,234.50 = 389.86 : x
  2. Step 2: Convert to fraction form
    822.67/1,234.50 = 389.86/x
  3. Step 3: Cross multiply
    822.67x = 1,234.50 × 389.86
  4. Step 4: Simplify right side
    822.67x = 481,282.17
  5. Step 5: Solve for x
    x = 481,282.17/822.67
  6. Step 6: Final answer
    x = 585.02

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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.