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Finding the Fourth Proportional to 28,912.60, 43,358.10 and 20,121.40

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Solution

The fourth proportional to 28,912.60, 43,358.10 and 20,121.40 is: 30,174.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,912.60 : 43,358.10 = 20,121.40 : x
  2. Step 2: Convert to fraction form
    28,912.60/43,358.10 = 20,121.40/x
  3. Step 3: Cross multiply
    28,912.60x = 43,358.10 × 20,121.40
  4. Step 4: Simplify right side
    28,912.60x = 872,425,673.34
  5. Step 5: Solve for x
    x = 872,425,673.34/28,912.60
  6. Step 6: Final answer
    x = 30,174.58

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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.