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Finding the Fourth Proportional to 1,879.97, 2,819.38 and 646.67

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Solution

The fourth proportional to 1,879.97, 2,819.38 and 646.67 is: 969.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.97 : 2,819.38 = 646.67 : x
  2. Step 2: Convert to fraction form
    1,879.97/2,819.38 = 646.67/x
  3. Step 3: Cross multiply
    1,879.97x = 2,819.38 × 646.67
  4. Step 4: Simplify right side
    1,879.97x = 1,823,208.46
  5. Step 5: Solve for x
    x = 1,823,208.46/1,879.97
  6. Step 6: Final answer
    x = 969.81

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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.