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Finding the Fourth Proportional to 21,880.20, 32,771.70 and 18,964.20

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Solution

The fourth proportional to 21,880.20, 32,771.70 and 18,964.20 is: 28,404.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,880.20 : 32,771.70 = 18,964.20 : x
  2. Step 2: Convert to fraction form
    21,880.20/32,771.70 = 18,964.20/x
  3. Step 3: Cross multiply
    21,880.20x = 32,771.70 × 18,964.20
  4. Step 4: Simplify right side
    21,880.20x = 621,489,073.14
  5. Step 5: Solve for x
    x = 621,489,073.14/21,880.20
  6. Step 6: Final answer
    x = 28,404.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.