Home / 20,739.80-31,109.80-5,157.42

Finding the Fourth Proportional to 20,739.80, 31,109.80 and 5,157.42

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Solution

The fourth proportional to 20,739.80, 31,109.80 and 5,157.42 is: 7,736.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.80 : 31,109.80 = 5,157.42 : x
  2. Step 2: Convert to fraction form
    20,739.80/31,109.80 = 5,157.42/x
  3. Step 3: Cross multiply
    20,739.80x = 31,109.80 × 5,157.42
  4. Step 4: Simplify right side
    20,739.80x = 160,446,304.72
  5. Step 5: Solve for x
    x = 160,446,304.72/20,739.80
  6. Step 6: Final answer
    x = 7,736.15

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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.