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Finding the Fourth Proportional to 1,879.72, 2,819.58 and 853

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Solution

The fourth proportional to 1,879.72, 2,819.58 and 853 is: 1,279.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.72 : 2,819.58 = 853 : x
  2. Step 2: Convert to fraction form
    1,879.72/2,819.58 = 853/x
  3. Step 3: Cross multiply
    1,879.72x = 2,819.58 × 853
  4. Step 4: Simplify right side
    1,879.72x = 2,405,101.74
  5. Step 5: Solve for x
    x = 2,405,101.74/1,879.72
  6. Step 6: Final answer
    x = 1,279.50

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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.