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Finding the Fourth Proportional to 21,890.64, 32,627.97 and 20,645.22

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Solution

The fourth proportional to 21,890.64, 32,627.97 and 20,645.22 is: 30,771.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.64 : 32,627.97 = 20,645.22 : x
  2. Step 2: Convert to fraction form
    21,890.64/32,627.97 = 20,645.22/x
  3. Step 3: Cross multiply
    21,890.64x = 32,627.97 × 20,645.22
  4. Step 4: Simplify right side
    21,890.64x = 673,611,618.80
  5. Step 5: Solve for x
    x = 673,611,618.80/21,890.64
  6. Step 6: Final answer
    x = 30,771.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.