Home / 31,418.80-47,128.20-13,879.60

Finding the Fourth Proportional to 31,418.80, 47,128.20 and 13,879.60

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Solution

The fourth proportional to 31,418.80, 47,128.20 and 13,879.60 is: 20,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,418.80 : 47,128.20 = 13,879.60 : x
  2. Step 2: Convert to fraction form
    31,418.80/47,128.20 = 13,879.60/x
  3. Step 3: Cross multiply
    31,418.80x = 47,128.20 × 13,879.60
  4. Step 4: Simplify right side
    31,418.80x = 654,120,564.72
  5. Step 5: Solve for x
    x = 654,120,564.72/31,418.80
  6. Step 6: Final answer
    x = 20,819.40

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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.