Home / 20,900.09-28,840.22-12,400.75

Finding the Fourth Proportional to 20,900.09, 28,840.22 and 12,400.75

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Solution

The fourth proportional to 20,900.09, 28,840.22 and 12,400.75 is: 17,111.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.09 : 28,840.22 = 12,400.75 : x
  2. Step 2: Convert to fraction form
    20,900.09/28,840.22 = 12,400.75/x
  3. Step 3: Cross multiply
    20,900.09x = 28,840.22 × 12,400.75
  4. Step 4: Simplify right side
    20,900.09x = 357,640,378.71
  5. Step 5: Solve for x
    x = 357,640,378.71/20,900.09
  6. Step 6: Final answer
    x = 17,111.90

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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.