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Finding the Fourth Proportional to 20,639.56, 30,957.72 and 7,494.88

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Solution

The fourth proportional to 20,639.56, 30,957.72 and 7,494.88 is: 11,241.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.56 : 30,957.72 = 7,494.88 : x
  2. Step 2: Convert to fraction form
    20,639.56/30,957.72 = 7,494.88/x
  3. Step 3: Cross multiply
    20,639.56x = 30,957.72 × 7,494.88
  4. Step 4: Simplify right side
    20,639.56x = 232,024,396.47
  5. Step 5: Solve for x
    x = 232,024,396.47/20,639.56
  6. Step 6: Final answer
    x = 11,241.73

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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.