Home / 28,318.50-39,021.90-21,906.14

Finding the Fourth Proportional to 28,318.50, 39,021.90 and 21,906.14

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Solution

The fourth proportional to 28,318.50, 39,021.90 and 21,906.14 is: 30,185.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.50 : 39,021.90 = 21,906.14 : x
  2. Step 2: Convert to fraction form
    28,318.50/39,021.90 = 21,906.14/x
  3. Step 3: Cross multiply
    28,318.50x = 39,021.90 × 21,906.14
  4. Step 4: Simplify right side
    28,318.50x = 854,819,009.36
  5. Step 5: Solve for x
    x = 854,819,009.36/28,318.50
  6. Step 6: Final answer
    x = 30,185.89

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1.5x scale

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.