Home / 90,629.60-135,944.40-86,255.60

Finding the Fourth Proportional to 90,629.60, 135,944.40 and 86,255.60

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Solution

The fourth proportional to 90,629.60, 135,944.40 and 86,255.60 is: 129,383.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,629.60 : 135,944.40 = 86,255.60 : x
  2. Step 2: Convert to fraction form
    90,629.60/135,944.40 = 86,255.60/x
  3. Step 3: Cross multiply
    90,629.60x = 135,944.40 × 86,255.60
  4. Step 4: Simplify right side
    90,629.60x = 11,725,965,788.64
  5. Step 5: Solve for x
    x = 11,725,965,788.64/90,629.60
  6. Step 6: Final answer
    x = 129,383.40

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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.