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Finding the Fourth Proportional to 1,879.59, 2,819.68 and 646.69

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Solution

The fourth proportional to 1,879.59, 2,819.68 and 646.69 is: 970.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.59 : 2,819.68 = 646.69 : x
  2. Step 2: Convert to fraction form
    1,879.59/2,819.68 = 646.69/x
  3. Step 3: Cross multiply
    1,879.59x = 2,819.68 × 646.69
  4. Step 4: Simplify right side
    1,879.59x = 1,823,458.86
  5. Step 5: Solve for x
    x = 1,823,458.86/1,879.59
  6. Step 6: Final answer
    x = 970.14

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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.