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Finding the Fourth Proportional to 816.82, 1,225.29 and 489.99

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Solution

The fourth proportional to 816.82, 1,225.29 and 489.99 is: 735.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.82 : 1,225.29 = 489.99 : x
  2. Step 2: Convert to fraction form
    816.82/1,225.29 = 489.99/x
  3. Step 3: Cross multiply
    816.82x = 1,225.29 × 489.99
  4. Step 4: Simplify right side
    816.82x = 600,375.60
  5. Step 5: Solve for x
    x = 600,375.60/816.82
  6. Step 6: Final answer
    x = 735.02

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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.