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Finding the Fourth Proportional to 822.76, 1,234.66 and 389.94

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Solution

The fourth proportional to 822.76, 1,234.66 and 389.94 is: 585.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.76 : 1,234.66 = 389.94 : x
  2. Step 2: Convert to fraction form
    822.76/1,234.66 = 389.94/x
  3. Step 3: Cross multiply
    822.76x = 1,234.66 × 389.94
  4. Step 4: Simplify right side
    822.76x = 481,443.32
  5. Step 5: Solve for x
    x = 481,443.32/822.76
  6. Step 6: Final answer
    x = 585.16

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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.