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Finding the Fourth Proportional to 21,956.60, 32,934.90 and 20,142.20

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Solution

The fourth proportional to 21,956.60, 32,934.90 and 20,142.20 is: 30,213.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,956.60 : 32,934.90 = 20,142.20 : x
  2. Step 2: Convert to fraction form
    21,956.60/32,934.90 = 20,142.20/x
  3. Step 3: Cross multiply
    21,956.60x = 32,934.90 × 20,142.20
  4. Step 4: Simplify right side
    21,956.60x = 663,381,342.78
  5. Step 5: Solve for x
    x = 663,381,342.78/21,956.60
  6. Step 6: Final answer
    x = 30,213.30

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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.