Home / 28,861-39,828.80-15,940.21

Finding the Fourth Proportional to 28,861, 39,828.80 and 15,940.21

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Solution

The fourth proportional to 28,861, 39,828.80 and 15,940.21 is: 21,997.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,861 : 39,828.80 = 15,940.21 : x
  2. Step 2: Convert to fraction form
    28,861/39,828.80 = 15,940.21/x
  3. Step 3: Cross multiply
    28,861x = 39,828.80 × 15,940.21
  4. Step 4: Simplify right side
    28,861x = 634,879,436.05
  5. Step 5: Solve for x
    x = 634,879,436.05/28,861
  6. Step 6: Final answer
    x = 21,997.83

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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.