Home / 20,739.78-31,109.64-5,157.41

Finding the Fourth Proportional to 20,739.78, 31,109.64 and 5,157.41

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Solution

The fourth proportional to 20,739.78, 31,109.64 and 5,157.41 is: 7,736.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.78 : 31,109.64 = 5,157.41 : x
  2. Step 2: Convert to fraction form
    20,739.78/31,109.64 = 5,157.41/x
  3. Step 3: Cross multiply
    20,739.78x = 31,109.64 × 5,157.41
  4. Step 4: Simplify right side
    20,739.78x = 160,445,012.88
  5. Step 5: Solve for x
    x = 160,445,012.88/20,739.78
  6. Step 6: Final answer
    x = 7,736.10

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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.