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Finding the Fourth Proportional to 891.20, 1,229.81 and 492.84

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Solution

The fourth proportional to 891.20, 1,229.81 and 492.84 is: 680.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.20 : 1,229.81 = 492.84 : x
  2. Step 2: Convert to fraction form
    891.20/1,229.81 = 492.84/x
  3. Step 3: Cross multiply
    891.20x = 1,229.81 × 492.84
  4. Step 4: Simplify right side
    891.20x = 606,103.33
  5. Step 5: Solve for x
    x = 606,103.33/891.20
  6. Step 6: Final answer
    x = 680.10

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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.