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Finding the Fourth Proportional to 816.90, 1,222.26 and 486.62

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Solution

The fourth proportional to 816.90, 1,222.26 and 486.62 is: 728.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.90 : 1,222.26 = 486.62 : x
  2. Step 2: Convert to fraction form
    816.90/1,222.26 = 486.62/x
  3. Step 3: Cross multiply
    816.90x = 1,222.26 × 486.62
  4. Step 4: Simplify right side
    816.90x = 594,770.05
  5. Step 5: Solve for x
    x = 594,770.05/816.90
  6. Step 6: Final answer
    x = 728.08

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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.