Home / 20,739.21-31,105.77-10,206.45

Finding the Fourth Proportional to 20,739.21, 31,105.77 and 10,206.45

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Solution

The fourth proportional to 20,739.21, 31,105.77 and 10,206.45 is: 15,308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.21 : 31,105.77 = 10,206.45 : x
  2. Step 2: Convert to fraction form
    20,739.21/31,105.77 = 10,206.45/x
  3. Step 3: Cross multiply
    20,739.21x = 31,105.77 × 10,206.45
  4. Step 4: Simplify right side
    20,739.21x = 317,479,486.22
  5. Step 5: Solve for x
    x = 317,479,486.22/20,739.21
  6. Step 6: Final answer
    x = 15,308.18

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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.