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Finding the Fourth Proportional to 1,879.63, 2,819.70 and 783.74

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Solution

The fourth proportional to 1,879.63, 2,819.70 and 783.74 is: 1,175.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.63 : 2,819.70 = 783.74 : x
  2. Step 2: Convert to fraction form
    1,879.63/2,819.70 = 783.74/x
  3. Step 3: Cross multiply
    1,879.63x = 2,819.70 × 783.74
  4. Step 4: Simplify right side
    1,879.63x = 2,209,911.68
  5. Step 5: Solve for x
    x = 2,209,911.68/1,879.63
  6. Step 6: Final answer
    x = 1,175.72

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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.