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Finding the Fourth Proportional to 1,806.78, 2,709.09 and 652.80

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Solution

The fourth proportional to 1,806.78, 2,709.09 and 652.80 is: 978.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,806.78 : 2,709.09 = 652.80 : x
  2. Step 2: Convert to fraction form
    1,806.78/2,709.09 = 652.80/x
  3. Step 3: Cross multiply
    1,806.78x = 2,709.09 × 652.80
  4. Step 4: Simplify right side
    1,806.78x = 1,768,493.95
  5. Step 5: Solve for x
    x = 1,768,493.95/1,806.78
  6. Step 6: Final answer
    x = 978.81

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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.