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Finding the Fourth Proportional to 822.63, 1,234.35 and 618.96

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Solution

The fourth proportional to 822.63, 1,234.35 and 618.96 is: 928.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.63 : 1,234.35 = 618.96 : x
  2. Step 2: Convert to fraction form
    822.63/1,234.35 = 618.96/x
  3. Step 3: Cross multiply
    822.63x = 1,234.35 × 618.96
  4. Step 4: Simplify right side
    822.63x = 764,013.28
  5. Step 5: Solve for x
    x = 764,013.28/822.63
  6. Step 6: Final answer
    x = 928.74

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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.