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Finding the Fourth Proportional to 30,374.80, 45,540.28 and 20,489.56

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Solution

The fourth proportional to 30,374.80, 45,540.28 and 20,489.56 is: 30,719.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,374.80 : 45,540.28 = 20,489.56 : x
  2. Step 2: Convert to fraction form
    30,374.80/45,540.28 = 20,489.56/x
  3. Step 3: Cross multiply
    30,374.80x = 45,540.28 × 20,489.56
  4. Step 4: Simplify right side
    30,374.80x = 933,100,299.48
  5. Step 5: Solve for x
    x = 933,100,299.48/30,374.80
  6. Step 6: Final answer
    x = 30,719.55

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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.