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Finding the Fourth Proportional to 822.67, 1,134.87 and 557.12

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Solution

The fourth proportional to 822.67, 1,134.87 and 557.12 is: 768.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.67 : 1,134.87 = 557.12 : x
  2. Step 2: Convert to fraction form
    822.67/1,134.87 = 557.12/x
  3. Step 3: Cross multiply
    822.67x = 1,134.87 × 557.12
  4. Step 4: Simplify right side
    822.67x = 632,258.83
  5. Step 5: Solve for x
    x = 632,258.83/822.67
  6. Step 6: Final answer
    x = 768.54

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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.