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Finding the Fourth Proportional to 20,121.60, 30,124.80 and 17,817.60

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Solution

The fourth proportional to 20,121.60, 30,124.80 and 17,817.60 is: 26,675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.60 : 30,124.80 = 17,817.60 : x
  2. Step 2: Convert to fraction form
    20,121.60/30,124.80 = 17,817.60/x
  3. Step 3: Cross multiply
    20,121.60x = 30,124.80 × 17,817.60
  4. Step 4: Simplify right side
    20,121.60x = 536,751,636.48
  5. Step 5: Solve for x
    x = 536,751,636.48/20,121.60
  6. Step 6: Final answer
    x = 26,675.40

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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.