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Finding the Fourth Proportional to 822.56, 1,234.45 and 389.72

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Solution

The fourth proportional to 822.56, 1,234.45 and 389.72 is: 584.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.56 : 1,234.45 = 389.72 : x
  2. Step 2: Convert to fraction form
    822.56/1,234.45 = 389.72/x
  3. Step 3: Cross multiply
    822.56x = 1,234.45 × 389.72
  4. Step 4: Simplify right side
    822.56x = 481,090.83
  5. Step 5: Solve for x
    x = 481,090.83/822.56
  6. Step 6: Final answer
    x = 584.87

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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.