Home / 20,928.90-28,873.71-11,971.62

Finding the Fourth Proportional to 20,928.90, 28,873.71 and 11,971.62

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Solution

The fourth proportional to 20,928.90, 28,873.71 and 11,971.62 is: 16,516.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.90 : 28,873.71 = 11,971.62 : x
  2. Step 2: Convert to fraction form
    20,928.90/28,873.71 = 11,971.62/x
  3. Step 3: Cross multiply
    20,928.90x = 28,873.71 × 11,971.62
  4. Step 4: Simplify right side
    20,928.90x = 345,665,084.11
  5. Step 5: Solve for x
    x = 345,665,084.11/20,928.90
  6. Step 6: Final answer
    x = 16,516.16

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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.