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Finding the Fourth Proportional to 90,149.60, 135,246.54 and 30,986.12

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Solution

The fourth proportional to 90,149.60, 135,246.54 and 30,986.12 is: 46,486.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,149.60 : 135,246.54 = 30,986.12 : x
  2. Step 2: Convert to fraction form
    90,149.60/135,246.54 = 30,986.12/x
  3. Step 3: Cross multiply
    90,149.60x = 135,246.54 × 30,986.12
  4. Step 4: Simplify right side
    90,149.60x = 4,190,765,518.02
  5. Step 5: Solve for x
    x = 4,190,765,518.02/90,149.60
  6. Step 6: Final answer
    x = 46,486.79

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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.