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Finding the Fourth Proportional to 45,361.79, 68,019.21 and 20,380.47

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Solution

The fourth proportional to 45,361.79, 68,019.21 and 20,380.47 is: 30,560.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,361.79 : 68,019.21 = 20,380.47 : x
  2. Step 2: Convert to fraction form
    45,361.79/68,019.21 = 20,380.47/x
  3. Step 3: Cross multiply
    45,361.79x = 68,019.21 × 20,380.47
  4. Step 4: Simplify right side
    45,361.79x = 1,386,263,468.83
  5. Step 5: Solve for x
    x = 1,386,263,468.83/45,361.79
  6. Step 6: Final answer
    x = 30,560.16

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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.