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Finding the Fourth Proportional to 874.20, 1,309.70 and 736.60

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Solution

The fourth proportional to 874.20, 1,309.70 and 736.60 is: 1,103.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.20 : 1,309.70 = 736.60 : x
  2. Step 2: Convert to fraction form
    874.20/1,309.70 = 736.60/x
  3. Step 3: Cross multiply
    874.20x = 1,309.70 × 736.60
  4. Step 4: Simplify right side
    874.20x = 964,725.02
  5. Step 5: Solve for x
    x = 964,725.02/874.20
  6. Step 6: Final answer
    x = 1,103.55

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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.