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Finding the Fourth Proportional to 20,302.80, 30,467.80 and 7,155.20

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Solution

The fourth proportional to 20,302.80, 30,467.80 and 7,155.20 is: 10,737.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,302.80 : 30,467.80 = 7,155.20 : x
  2. Step 2: Convert to fraction form
    20,302.80/30,467.80 = 7,155.20/x
  3. Step 3: Cross multiply
    20,302.80x = 30,467.80 × 7,155.20
  4. Step 4: Simplify right side
    20,302.80x = 218,003,202.56
  5. Step 5: Solve for x
    x = 218,003,202.56/20,302.80
  6. Step 6: Final answer
    x = 10,737.59

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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.