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Finding the Fourth Proportional to 20,600.55, 30,900.72 and 7,449.78

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Solution

The fourth proportional to 20,600.55, 30,900.72 and 7,449.78 is: 11,174.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,600.55 : 30,900.72 = 7,449.78 : x
  2. Step 2: Convert to fraction form
    20,600.55/30,900.72 = 7,449.78/x
  3. Step 3: Cross multiply
    20,600.55x = 30,900.72 × 7,449.78
  4. Step 4: Simplify right side
    20,600.55x = 230,203,565.84
  5. Step 5: Solve for x
    x = 230,203,565.84/20,600.55
  6. Step 6: Final answer
    x = 11,174.63

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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.