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Finding the Fourth Proportional to 20,698.40, 31,047.60 and 17,879.60

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Solution

The fourth proportional to 20,698.40, 31,047.60 and 17,879.60 is: 26,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,698.40 : 31,047.60 = 17,879.60 : x
  2. Step 2: Convert to fraction form
    20,698.40/31,047.60 = 17,879.60/x
  3. Step 3: Cross multiply
    20,698.40x = 31,047.60 × 17,879.60
  4. Step 4: Simplify right side
    20,698.40x = 555,118,668.96
  5. Step 5: Solve for x
    x = 555,118,668.96/20,698.40
  6. Step 6: Final answer
    x = 26,819.40

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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.