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Finding the Fourth Proportional to 78,179.95, 117,268.94 and 19,015.66

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Solution

The fourth proportional to 78,179.95, 117,268.94 and 19,015.66 is: 28,523.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,179.95 : 117,268.94 = 19,015.66 : x
  2. Step 2: Convert to fraction form
    78,179.95/117,268.94 = 19,015.66/x
  3. Step 3: Cross multiply
    78,179.95x = 117,268.94 × 19,015.66
  4. Step 4: Simplify right side
    78,179.95x = 2,229,945,705.26
  5. Step 5: Solve for x
    x = 2,229,945,705.26/78,179.95
  6. Step 6: Final answer
    x = 28,523.24

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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.