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Finding the Fourth Proportional to 1,273.21, 1,910.40 and 785.95

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Solution

The fourth proportional to 1,273.21, 1,910.40 and 785.95 is: 1,179.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.21 : 1,910.40 = 785.95 : x
  2. Step 2: Convert to fraction form
    1,273.21/1,910.40 = 785.95/x
  3. Step 3: Cross multiply
    1,273.21x = 1,910.40 × 785.95
  4. Step 4: Simplify right side
    1,273.21x = 1,501,478.88
  5. Step 5: Solve for x
    x = 1,501,478.88/1,273.21
  6. Step 6: Final answer
    x = 1,179.29

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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.