Home / 21,072.80-28,991.04-20,489.60

Finding the Fourth Proportional to 21,072.80, 28,991.04 and 20,489.60

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Solution

The fourth proportional to 21,072.80, 28,991.04 and 20,489.60 is: 28,188.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,072.80 : 28,991.04 = 20,489.60 : x
  2. Step 2: Convert to fraction form
    21,072.80/28,991.04 = 20,489.60/x
  3. Step 3: Cross multiply
    21,072.80x = 28,991.04 × 20,489.60
  4. Step 4: Simplify right side
    21,072.80x = 594,014,813.18
  5. Step 5: Solve for x
    x = 594,014,813.18/21,072.80
  6. Step 6: Final answer
    x = 28,188.70

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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.