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Finding the Fourth Proportional to 1,879.61, 2,819.81 and 784.08

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Solution

The fourth proportional to 1,879.61, 2,819.81 and 784.08 is: 1,176.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.61 : 2,819.81 = 784.08 : x
  2. Step 2: Convert to fraction form
    1,879.61/2,819.81 = 784.08/x
  3. Step 3: Cross multiply
    1,879.61x = 2,819.81 × 784.08
  4. Step 4: Simplify right side
    1,879.61x = 2,210,958.59
  5. Step 5: Solve for x
    x = 2,210,958.59/1,879.61
  6. Step 6: Final answer
    x = 1,176.29

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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.