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Finding the Fourth Proportional to 822.54, 1,135.09 and 612.89

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Solution

The fourth proportional to 822.54, 1,135.09 and 612.89 is: 845.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.54 : 1,135.09 = 612.89 : x
  2. Step 2: Convert to fraction form
    822.54/1,135.09 = 612.89/x
  3. Step 3: Cross multiply
    822.54x = 1,135.09 × 612.89
  4. Step 4: Simplify right side
    822.54x = 695,685.31
  5. Step 5: Solve for x
    x = 695,685.31/822.54
  6. Step 6: Final answer
    x = 845.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.