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Finding the Fourth Proportional to 55,728.40, 83,592.60 and 20,660.80

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Solution

The fourth proportional to 55,728.40, 83,592.60 and 20,660.80 is: 30,991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,728.40 : 83,592.60 = 20,660.80 : x
  2. Step 2: Convert to fraction form
    55,728.40/83,592.60 = 20,660.80/x
  3. Step 3: Cross multiply
    55,728.40x = 83,592.60 × 20,660.80
  4. Step 4: Simplify right side
    55,728.40x = 1,727,089,990.08
  5. Step 5: Solve for x
    x = 1,727,089,990.08/55,728.40
  6. Step 6: Final answer
    x = 30,991.20

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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.