Home / 78,219.09-117,327.42-31,470.75

Finding the Fourth Proportional to 78,219.09, 117,327.42 and 31,470.75

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Solution

The fourth proportional to 78,219.09, 117,327.42 and 31,470.75 is: 47,205.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,219.09 : 117,327.42 = 31,470.75 : x
  2. Step 2: Convert to fraction form
    78,219.09/117,327.42 = 31,470.75/x
  3. Step 3: Cross multiply
    78,219.09x = 117,327.42 × 31,470.75
  4. Step 4: Simplify right side
    78,219.09x = 3,692,381,902.97
  5. Step 5: Solve for x
    x = 3,692,381,902.97/78,219.09
  6. Step 6: Final answer
    x = 47,205.64

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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.