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Finding the Fourth Proportional to 90,405.63, 135,558.77 and 71,804.79

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Solution

The fourth proportional to 90,405.63, 135,558.77 and 71,804.79 is: 107,667.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,405.63 : 135,558.77 = 71,804.79 : x
  2. Step 2: Convert to fraction form
    90,405.63/135,558.77 = 71,804.79/x
  3. Step 3: Cross multiply
    90,405.63x = 135,558.77 × 71,804.79
  4. Step 4: Simplify right side
    90,405.63x = 9,733,768,653.48
  5. Step 5: Solve for x
    x = 9,733,768,653.48/90,405.63
  6. Step 6: Final answer
    x = 107,667.73

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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.