Home / 20,951.40-28,917.36-13,289.73

Finding the Fourth Proportional to 20,951.40, 28,917.36 and 13,289.73

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Solution

The fourth proportional to 20,951.40, 28,917.36 and 13,289.73 is: 18,342.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.40 : 28,917.36 = 13,289.73 : x
  2. Step 2: Convert to fraction form
    20,951.40/28,917.36 = 13,289.73/x
  3. Step 3: Cross multiply
    20,951.40x = 28,917.36 × 13,289.73
  4. Step 4: Simplify right side
    20,951.40x = 384,303,906.71
  5. Step 5: Solve for x
    x = 384,303,906.71/20,951.40
  6. Step 6: Final answer
    x = 18,342.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.