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Finding the Fourth Proportional to 817.11, 1,222.60 and 486.84

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Solution

The fourth proportional to 817.11, 1,222.60 and 486.84 is: 728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.11 : 1,222.60 = 486.84 : x
  2. Step 2: Convert to fraction form
    817.11/1,222.60 = 486.84/x
  3. Step 3: Cross multiply
    817.11x = 1,222.60 × 486.84
  4. Step 4: Simplify right side
    817.11x = 595,210.58
  5. Step 5: Solve for x
    x = 595,210.58/817.11
  6. Step 6: Final answer
    x = 728.43

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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.