Home / 81,619.20-122,457.60-78,739.20

Finding the Fourth Proportional to 81,619.20, 122,457.60 and 78,739.20

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Solution

The fourth proportional to 81,619.20, 122,457.60 and 78,739.20 is: 118,136.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,619.20 : 122,457.60 = 78,739.20 : x
  2. Step 2: Convert to fraction form
    81,619.20/122,457.60 = 78,739.20/x
  3. Step 3: Cross multiply
    81,619.20x = 122,457.60 × 78,739.20
  4. Step 4: Simplify right side
    81,619.20x = 9,642,213,457.92
  5. Step 5: Solve for x
    x = 9,642,213,457.92/81,619.20
  6. Step 6: Final answer
    x = 118,136.58

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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.