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Finding the Fourth Proportional to 28,914.60, 43,361.10 and 20,123.40

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Solution

The fourth proportional to 28,914.60, 43,361.10 and 20,123.40 is: 30,177.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,914.60 : 43,361.10 = 20,123.40 : x
  2. Step 2: Convert to fraction form
    28,914.60/43,361.10 = 20,123.40/x
  3. Step 3: Cross multiply
    28,914.60x = 43,361.10 × 20,123.40
  4. Step 4: Simplify right side
    28,914.60x = 872,572,759.74
  5. Step 5: Solve for x
    x = 872,572,759.74/28,914.60
  6. Step 6: Final answer
    x = 30,177.58

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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.