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Finding the Fourth Proportional to 45,824.56, 68,728.60 and 20,858.80

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Solution

The fourth proportional to 45,824.56, 68,728.60 and 20,858.80 is: 31,284.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,824.56 : 68,728.60 = 20,858.80 : x
  2. Step 2: Convert to fraction form
    45,824.56/68,728.60 = 20,858.80/x
  3. Step 3: Cross multiply
    45,824.56x = 68,728.60 × 20,858.80
  4. Step 4: Simplify right side
    45,824.56x = 1,433,596,121.68
  5. Step 5: Solve for x
    x = 1,433,596,121.68/45,824.56
  6. Step 6: Final answer
    x = 31,284.45

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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.