Home / 12,485.60-18,728.20-3,720.56

Finding the Fourth Proportional to 12,485.60, 18,728.20 and 3,720.56

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Solution

The fourth proportional to 12,485.60, 18,728.20 and 3,720.56 is: 5,580.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.60 : 18,728.20 = 3,720.56 : x
  2. Step 2: Convert to fraction form
    12,485.60/18,728.20 = 3,720.56/x
  3. Step 3: Cross multiply
    12,485.60x = 18,728.20 × 3,720.56
  4. Step 4: Simplify right side
    12,485.60x = 69,679,391.79
  5. Step 5: Solve for x
    x = 69,679,391.79/12,485.60
  6. Step 6: Final answer
    x = 5,580.78

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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.