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Finding the Fourth Proportional to 2,668.68, 4,003.22 and 821.07

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Solution

The fourth proportional to 2,668.68, 4,003.22 and 821.07 is: 1,231.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.68 : 4,003.22 = 821.07 : x
  2. Step 2: Convert to fraction form
    2,668.68/4,003.22 = 821.07/x
  3. Step 3: Cross multiply
    2,668.68x = 4,003.22 × 821.07
  4. Step 4: Simplify right side
    2,668.68x = 3,286,925.90
  5. Step 5: Solve for x
    x = 3,286,925.90/2,668.68
  6. Step 6: Final answer
    x = 1,231.67

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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.