Home / 81,439.20-122,069.70-28,821.60

Finding the Fourth Proportional to 81,439.20, 122,069.70 and 28,821.60

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Solution

The fourth proportional to 81,439.20, 122,069.70 and 28,821.60 is: 43,200.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.20 : 122,069.70 = 28,821.60 : x
  2. Step 2: Convert to fraction form
    81,439.20/122,069.70 = 28,821.60/x
  3. Step 3: Cross multiply
    81,439.20x = 122,069.70 × 28,821.60
  4. Step 4: Simplify right side
    81,439.20x = 3,518,244,065.52
  5. Step 5: Solve for x
    x = 3,518,244,065.52/81,439.20
  6. Step 6: Final answer
    x = 43,200.87

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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.