Home / 20,858.20-31,238.70-20,440.60

Finding the Fourth Proportional to 20,858.20, 31,238.70 and 20,440.60

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Solution

The fourth proportional to 20,858.20, 31,238.70 and 20,440.60 is: 30,613.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.20 : 31,238.70 = 20,440.60 : x
  2. Step 2: Convert to fraction form
    20,858.20/31,238.70 = 20,440.60/x
  3. Step 3: Cross multiply
    20,858.20x = 31,238.70 × 20,440.60
  4. Step 4: Simplify right side
    20,858.20x = 638,537,771.22
  5. Step 5: Solve for x
    x = 638,537,771.22/20,858.20
  6. Step 6: Final answer
    x = 30,613.27

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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.