Home / 21,069.80-28,986.90-20,486.60

Finding the Fourth Proportional to 21,069.80, 28,986.90 and 20,486.60

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Solution

The fourth proportional to 21,069.80, 28,986.90 and 20,486.60 is: 28,184.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,069.80 : 28,986.90 = 20,486.60 : x
  2. Step 2: Convert to fraction form
    21,069.80/28,986.90 = 20,486.60/x
  3. Step 3: Cross multiply
    21,069.80x = 28,986.90 × 20,486.60
  4. Step 4: Simplify right side
    21,069.80x = 593,843,025.54
  5. Step 5: Solve for x
    x = 593,843,025.54/21,069.80
  6. Step 6: Final answer
    x = 28,184.56

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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.