Home / 20,771.16-28,665.86-11,821.40

Finding the Fourth Proportional to 20,771.16, 28,665.86 and 11,821.40

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Solution

The fourth proportional to 20,771.16, 28,665.86 and 11,821.40 is: 16,314.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.16 : 28,665.86 = 11,821.40 : x
  2. Step 2: Convert to fraction form
    20,771.16/28,665.86 = 11,821.40/x
  3. Step 3: Cross multiply
    20,771.16x = 28,665.86 × 11,821.40
  4. Step 4: Simplify right side
    20,771.16x = 338,870,597.40
  5. Step 5: Solve for x
    x = 338,870,597.40/20,771.16
  6. Step 6: Final answer
    x = 16,314.48

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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.