Home / 21,010.80-31,451.40-12,219.60

Finding the Fourth Proportional to 21,010.80, 31,451.40 and 12,219.60

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Solution

The fourth proportional to 21,010.80, 31,451.40 and 12,219.60 is: 18,291.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.80 : 31,451.40 = 12,219.60 : x
  2. Step 2: Convert to fraction form
    21,010.80/31,451.40 = 12,219.60/x
  3. Step 3: Cross multiply
    21,010.80x = 31,451.40 × 12,219.60
  4. Step 4: Simplify right side
    21,010.80x = 384,323,527.44
  5. Step 5: Solve for x
    x = 384,323,527.44/21,010.80
  6. Step 6: Final answer
    x = 18,291.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.