Home / 90,021.40-135,032.10-79,912.60

Finding the Fourth Proportional to 90,021.40, 135,032.10 and 79,912.60

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Solution

The fourth proportional to 90,021.40, 135,032.10 and 79,912.60 is: 119,868.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,021.40 : 135,032.10 = 79,912.60 : x
  2. Step 2: Convert to fraction form
    90,021.40/135,032.10 = 79,912.60/x
  3. Step 3: Cross multiply
    90,021.40x = 135,032.10 × 79,912.60
  4. Step 4: Simplify right side
    90,021.40x = 10,790,766,194.46
  5. Step 5: Solve for x
    x = 10,790,766,194.46/90,021.40
  6. Step 6: Final answer
    x = 119,868.90

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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.