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Finding the Fourth Proportional to 1,189.23, 1,640.05 and 874.80

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Solution

The fourth proportional to 1,189.23, 1,640.05 and 874.80 is: 1,206.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.23 : 1,640.05 = 874.80 : x
  2. Step 2: Convert to fraction form
    1,189.23/1,640.05 = 874.80/x
  3. Step 3: Cross multiply
    1,189.23x = 1,640.05 × 874.80
  4. Step 4: Simplify right side
    1,189.23x = 1,434,713.55
  5. Step 5: Solve for x
    x = 1,434,713.55/1,189.23
  6. Step 6: Final answer
    x = 1,206.42

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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.