Home / 21,194.40-31,791.60-12,890.70

Finding the Fourth Proportional to 21,194.40, 31,791.60 and 12,890.70

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Solution

The fourth proportional to 21,194.40, 31,791.60 and 12,890.70 is: 19,336.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,194.40 : 31,791.60 = 12,890.70 : x
  2. Step 2: Convert to fraction form
    21,194.40/31,791.60 = 12,890.70/x
  3. Step 3: Cross multiply
    21,194.40x = 31,791.60 × 12,890.70
  4. Step 4: Simplify right side
    21,194.40x = 409,815,978.12
  5. Step 5: Solve for x
    x = 409,815,978.12/21,194.40
  6. Step 6: Final answer
    x = 19,336.05

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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.