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Finding the Fourth Proportional to 813.78, 1,121.97 and 533.58

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Solution

The fourth proportional to 813.78, 1,121.97 and 533.58 is: 735.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.78 : 1,121.97 = 533.58 : x
  2. Step 2: Convert to fraction form
    813.78/1,121.97 = 533.58/x
  3. Step 3: Cross multiply
    813.78x = 1,121.97 × 533.58
  4. Step 4: Simplify right side
    813.78x = 598,660.75
  5. Step 5: Solve for x
    x = 598,660.75/813.78
  6. Step 6: Final answer
    x = 735.65

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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.