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Finding the Fourth Proportional to 876.50, 1,209.58 and 611.33

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Solution

The fourth proportional to 876.50, 1,209.58 and 611.33 is: 843.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.50 : 1,209.58 = 611.33 : x
  2. Step 2: Convert to fraction form
    876.50/1,209.58 = 611.33/x
  3. Step 3: Cross multiply
    876.50x = 1,209.58 × 611.33
  4. Step 4: Simplify right side
    876.50x = 739,452.54
  5. Step 5: Solve for x
    x = 739,452.54/876.50
  6. Step 6: Final answer
    x = 843.64

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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.