Home / 81,768.20-122,825.10-78,830.60

Finding the Fourth Proportional to 81,768.20, 122,825.10 and 78,830.60

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Solution

The fourth proportional to 81,768.20, 122,825.10 and 78,830.60 is: 118,412.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,768.20 : 122,825.10 = 78,830.60 : x
  2. Step 2: Convert to fraction form
    81,768.20/122,825.10 = 78,830.60/x
  3. Step 3: Cross multiply
    81,768.20x = 122,825.10 × 78,830.60
  4. Step 4: Simplify right side
    81,768.20x = 9,682,376,328.06
  5. Step 5: Solve for x
    x = 9,682,376,328.06/81,768.20
  6. Step 6: Final answer
    x = 118,412.49

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1.5x scale

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.