Home / 20,390.30-28,139.73-11,440.64

Finding the Fourth Proportional to 20,390.30, 28,139.73 and 11,440.64

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Solution

The fourth proportional to 20,390.30, 28,139.73 and 11,440.64 is: 15,788.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.30 : 28,139.73 = 11,440.64 : x
  2. Step 2: Convert to fraction form
    20,390.30/28,139.73 = 11,440.64/x
  3. Step 3: Cross multiply
    20,390.30x = 28,139.73 × 11,440.64
  4. Step 4: Simplify right side
    20,390.30x = 321,936,520.63
  5. Step 5: Solve for x
    x = 321,936,520.63/20,390.30
  6. Step 6: Final answer
    x = 15,788.71

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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.