Home / 28,318-39,021.21-21,905.64

Finding the Fourth Proportional to 28,318, 39,021.21 and 21,905.64

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Solution

The fourth proportional to 28,318, 39,021.21 and 21,905.64 is: 30,185.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318 : 39,021.21 = 21,905.64 : x
  2. Step 2: Convert to fraction form
    28,318/39,021.21 = 21,905.64/x
  3. Step 3: Cross multiply
    28,318x = 39,021.21 × 21,905.64
  4. Step 4: Simplify right side
    28,318x = 854,784,578.62
  5. Step 5: Solve for x
    x = 854,784,578.62/28,318
  6. Step 6: Final answer
    x = 30,185.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.