Home / 81,475.20-122,212.80-78,194.70

Finding the Fourth Proportional to 81,475.20, 122,212.80 and 78,194.70

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Solution

The fourth proportional to 81,475.20, 122,212.80 and 78,194.70 is: 117,292.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,475.20 : 122,212.80 = 78,194.70 : x
  2. Step 2: Convert to fraction form
    81,475.20/122,212.80 = 78,194.70/x
  3. Step 3: Cross multiply
    81,475.20x = 122,212.80 × 78,194.70
  4. Step 4: Simplify right side
    81,475.20x = 9,556,393,232.16
  5. Step 5: Solve for x
    x = 9,556,393,232.16/81,475.20
  6. Step 6: Final answer
    x = 117,292.05

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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.