Home / 20,728.20-31,043.70-14,118.60

Finding the Fourth Proportional to 20,728.20, 31,043.70 and 14,118.60

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Solution

The fourth proportional to 20,728.20, 31,043.70 and 14,118.60 is: 21,144.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.20 : 31,043.70 = 14,118.60 : x
  2. Step 2: Convert to fraction form
    20,728.20/31,043.70 = 14,118.60/x
  3. Step 3: Cross multiply
    20,728.20x = 31,043.70 × 14,118.60
  4. Step 4: Simplify right side
    20,728.20x = 438,293,582.82
  5. Step 5: Solve for x
    x = 438,293,582.82/20,728.20
  6. Step 6: Final answer
    x = 21,144.80

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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.