Home / 215,238.60-322,742.70-90,438.60

Finding the Fourth Proportional to 215,238.60, 322,742.70 and 90,438.60

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Solution

The fourth proportional to 215,238.60, 322,742.70 and 90,438.60 is: 135,609.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,238.60 : 322,742.70 = 90,438.60 : x
  2. Step 2: Convert to fraction form
    215,238.60/322,742.70 = 90,438.60/x
  3. Step 3: Cross multiply
    215,238.60x = 322,742.70 × 90,438.60
  4. Step 4: Simplify right side
    215,238.60x = 29,188,397,948.22
  5. Step 5: Solve for x
    x = 29,188,397,948.22/215,238.60
  6. Step 6: Final answer
    x = 135,609.50

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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.