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Finding the Fourth Proportional to 90,620.40, 135,865.80 and 40,659.60

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Solution

The fourth proportional to 90,620.40, 135,865.80 and 40,659.60 is: 60,960.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,620.40 : 135,865.80 = 40,659.60 : x
  2. Step 2: Convert to fraction form
    90,620.40/135,865.80 = 40,659.60/x
  3. Step 3: Cross multiply
    90,620.40x = 135,865.80 × 40,659.60
  4. Step 4: Simplify right side
    90,620.40x = 5,524,249,081.68
  5. Step 5: Solve for x
    x = 5,524,249,081.68/90,620.40
  6. Step 6: Final answer
    x = 60,960.33

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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.