Home / 20,690.73-31,043.58-12,783.99

Finding the Fourth Proportional to 20,690.73, 31,043.58 and 12,783.99

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Solution

The fourth proportional to 20,690.73, 31,043.58 and 12,783.99 is: 19,180.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.73 : 31,043.58 = 12,783.99 : x
  2. Step 2: Convert to fraction form
    20,690.73/31,043.58 = 12,783.99/x
  3. Step 3: Cross multiply
    20,690.73x = 31,043.58 × 12,783.99
  4. Step 4: Simplify right side
    20,690.73x = 396,860,816.28
  5. Step 5: Solve for x
    x = 396,860,816.28/20,690.73
  6. Step 6: Final answer
    x = 19,180.61

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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.