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Finding the Fourth Proportional to 21,903.20, 32,854.80 and 20,213.60

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Solution

The fourth proportional to 21,903.20, 32,854.80 and 20,213.60 is: 30,320.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,903.20 : 32,854.80 = 20,213.60 : x
  2. Step 2: Convert to fraction form
    21,903.20/32,854.80 = 20,213.60/x
  3. Step 3: Cross multiply
    21,903.20x = 32,854.80 × 20,213.60
  4. Step 4: Simplify right side
    21,903.20x = 664,113,785.28
  5. Step 5: Solve for x
    x = 664,113,785.28/21,903.20
  6. Step 6: Final answer
    x = 30,320.40

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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.