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Finding the Fourth Proportional to 833.80, 1,247.82 and 641.80

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Solution

The fourth proportional to 833.80, 1,247.82 and 641.80 is: 960.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.80 : 1,247.82 = 641.80 : x
  2. Step 2: Convert to fraction form
    833.80/1,247.82 = 641.80/x
  3. Step 3: Cross multiply
    833.80x = 1,247.82 × 641.80
  4. Step 4: Simplify right side
    833.80x = 800,850.88
  5. Step 5: Solve for x
    x = 800,850.88/833.80
  6. Step 6: Final answer
    x = 960.48

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1.5x scale

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.