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Finding the Fourth Proportional to 1,169.63, 1,614.09 and 645.69

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Solution

The fourth proportional to 1,169.63, 1,614.09 and 645.69 is: 891.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.63 : 1,614.09 = 645.69 : x
  2. Step 2: Convert to fraction form
    1,169.63/1,614.09 = 645.69/x
  3. Step 3: Cross multiply
    1,169.63x = 1,614.09 × 645.69
  4. Step 4: Simplify right side
    1,169.63x = 1,042,201.77
  5. Step 5: Solve for x
    x = 1,042,201.77/1,169.63
  6. Step 6: Final answer
    x = 891.05

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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.