Home / 28,356.70-39,129.94-16,420.80

Finding the Fourth Proportional to 28,356.70, 39,129.94 and 16,420.80

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Solution

The fourth proportional to 28,356.70, 39,129.94 and 16,420.80 is: 22,659.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.70 : 39,129.94 = 16,420.80 : x
  2. Step 2: Convert to fraction form
    28,356.70/39,129.94 = 16,420.80/x
  3. Step 3: Cross multiply
    28,356.70x = 39,129.94 × 16,420.80
  4. Step 4: Simplify right side
    28,356.70x = 642,544,918.75
  5. Step 5: Solve for x
    x = 642,544,918.75/28,356.70
  6. Step 6: Final answer
    x = 22,659.37

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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.