Home / 20,912.40-31,368.60-18,579.60

Finding the Fourth Proportional to 20,912.40, 31,368.60 and 18,579.60

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Solution

The fourth proportional to 20,912.40, 31,368.60 and 18,579.60 is: 27,869.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.40 : 31,368.60 = 18,579.60 : x
  2. Step 2: Convert to fraction form
    20,912.40/31,368.60 = 18,579.60/x
  3. Step 3: Cross multiply
    20,912.40x = 31,368.60 × 18,579.60
  4. Step 4: Simplify right side
    20,912.40x = 582,816,040.56
  5. Step 5: Solve for x
    x = 582,816,040.56/20,912.40
  6. Step 6: Final answer
    x = 27,869.40

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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.