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Finding the Fourth Proportional to 822.56, 1,135.54 and 561.96

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Solution

The fourth proportional to 822.56, 1,135.54 and 561.96 is: 775.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.56 : 1,135.54 = 561.96 : x
  2. Step 2: Convert to fraction form
    822.56/1,135.54 = 561.96/x
  3. Step 3: Cross multiply
    822.56x = 1,135.54 × 561.96
  4. Step 4: Simplify right side
    822.56x = 638,128.06
  5. Step 5: Solve for x
    x = 638,128.06/822.56
  6. Step 6: Final answer
    x = 775.78

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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.