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Finding the Fourth Proportional to 1,081.89, 1,620.99 and 909.68

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Solution

The fourth proportional to 1,081.89, 1,620.99 and 909.68 is: 1,362.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.89 : 1,620.99 = 909.68 : x
  2. Step 2: Convert to fraction form
    1,081.89/1,620.99 = 909.68/x
  3. Step 3: Cross multiply
    1,081.89x = 1,620.99 × 909.68
  4. Step 4: Simplify right side
    1,081.89x = 1,474,574.08
  5. Step 5: Solve for x
    x = 1,474,574.08/1,081.89
  6. Step 6: Final answer
    x = 1,362.96

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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.