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Finding the Fourth Proportional to 822.18, 1,230.20 and 493.29

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Solution

The fourth proportional to 822.18, 1,230.20 and 493.29 is: 738.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.18 : 1,230.20 = 493.29 : x
  2. Step 2: Convert to fraction form
    822.18/1,230.20 = 493.29/x
  3. Step 3: Cross multiply
    822.18x = 1,230.20 × 493.29
  4. Step 4: Simplify right side
    822.18x = 606,845.36
  5. Step 5: Solve for x
    x = 606,845.36/822.18
  6. Step 6: Final answer
    x = 738.09

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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.