Home / 20,981.76-28,954.83-11,550.25

Finding the Fourth Proportional to 20,981.76, 28,954.83 and 11,550.25

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Solution

The fourth proportional to 20,981.76, 28,954.83 and 11,550.25 is: 15,939.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.76 : 28,954.83 = 11,550.25 : x
  2. Step 2: Convert to fraction form
    20,981.76/28,954.83 = 11,550.25/x
  3. Step 3: Cross multiply
    20,981.76x = 28,954.83 × 11,550.25
  4. Step 4: Simplify right side
    20,981.76x = 334,435,525.21
  5. Step 5: Solve for x
    x = 334,435,525.21/20,981.76
  6. Step 6: Final answer
    x = 15,939.35

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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.