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Finding the Fourth Proportional to 18,579.60, 27,820.80 and 13,622.40

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Solution

The fourth proportional to 18,579.60, 27,820.80 and 13,622.40 is: 20,397.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,579.60 : 27,820.80 = 13,622.40 : x
  2. Step 2: Convert to fraction form
    18,579.60/27,820.80 = 13,622.40/x
  3. Step 3: Cross multiply
    18,579.60x = 27,820.80 × 13,622.40
  4. Step 4: Simplify right side
    18,579.60x = 378,986,065.92
  5. Step 5: Solve for x
    x = 378,986,065.92/18,579.60
  6. Step 6: Final answer
    x = 20,397.97

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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.