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Finding the Fourth Proportional to 1,918.99, 2,879.30 and 808.68

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Solution

The fourth proportional to 1,918.99, 2,879.30 and 808.68 is: 1,213.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.99 : 2,879.30 = 808.68 : x
  2. Step 2: Convert to fraction form
    1,918.99/2,879.30 = 808.68/x
  3. Step 3: Cross multiply
    1,918.99x = 2,879.30 × 808.68
  4. Step 4: Simplify right side
    1,918.99x = 2,328,440.59
  5. Step 5: Solve for x
    x = 2,328,440.59/1,918.99
  6. Step 6: Final answer
    x = 1,213.37

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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.