Home / 20,739.85-31,109.77-5,157.48

Finding the Fourth Proportional to 20,739.85, 31,109.77 and 5,157.48

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Solution

The fourth proportional to 20,739.85, 31,109.77 and 5,157.48 is: 7,736.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.85 : 31,109.77 = 5,157.48 : x
  2. Step 2: Convert to fraction form
    20,739.85/31,109.77 = 5,157.48/x
  3. Step 3: Cross multiply
    20,739.85x = 31,109.77 × 5,157.48
  4. Step 4: Simplify right side
    20,739.85x = 160,447,861.03
  5. Step 5: Solve for x
    x = 160,447,861.03/20,739.85
  6. Step 6: Final answer
    x = 7,736.21

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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.