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Finding the Fourth Proportional to 90,653.60, 135,847.60 and 81,293.60

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Solution

The fourth proportional to 90,653.60, 135,847.60 and 81,293.60 is: 121,821.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,653.60 : 135,847.60 = 81,293.60 : x
  2. Step 2: Convert to fraction form
    90,653.60/135,847.60 = 81,293.60/x
  3. Step 3: Cross multiply
    90,653.60x = 135,847.60 × 81,293.60
  4. Step 4: Simplify right side
    90,653.60x = 11,043,540,455.36
  5. Step 5: Solve for x
    x = 11,043,540,455.36/90,653.60
  6. Step 6: Final answer
    x = 121,821.31

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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.