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Finding the Fourth Proportional to 1,021.11, 1,409.37 and 622.91

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Solution

The fourth proportional to 1,021.11, 1,409.37 and 622.91 is: 859.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.11 : 1,409.37 = 622.91 : x
  2. Step 2: Convert to fraction form
    1,021.11/1,409.37 = 622.91/x
  3. Step 3: Cross multiply
    1,021.11x = 1,409.37 × 622.91
  4. Step 4: Simplify right side
    1,021.11x = 877,906.57
  5. Step 5: Solve for x
    x = 877,906.57/1,021.11
  6. Step 6: Final answer
    x = 859.76

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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.