Home / 20,390.26-28,140.69-11,440.18

Finding the Fourth Proportional to 20,390.26, 28,140.69 and 11,440.18

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Solution

The fourth proportional to 20,390.26, 28,140.69 and 11,440.18 is: 15,788.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.26 : 28,140.69 = 11,440.18 : x
  2. Step 2: Convert to fraction form
    20,390.26/28,140.69 = 11,440.18/x
  3. Step 3: Cross multiply
    20,390.26x = 28,140.69 × 11,440.18
  4. Step 4: Simplify right side
    20,390.26x = 321,934,558.92
  5. Step 5: Solve for x
    x = 321,934,558.92/20,390.26
  6. Step 6: Final answer
    x = 15,788.64

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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.