Home / 20,739.50-31,109.38-5,157.13

Finding the Fourth Proportional to 20,739.50, 31,109.38 and 5,157.13

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Solution

The fourth proportional to 20,739.50, 31,109.38 and 5,157.13 is: 7,735.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.50 : 31,109.38 = 5,157.13 : x
  2. Step 2: Convert to fraction form
    20,739.50/31,109.38 = 5,157.13/x
  3. Step 3: Cross multiply
    20,739.50x = 31,109.38 × 5,157.13
  4. Step 4: Simplify right side
    20,739.50x = 160,435,026.21
  5. Step 5: Solve for x
    x = 160,435,026.21/20,739.50
  6. Step 6: Final answer
    x = 7,735.72

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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.