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Finding the Fourth Proportional to 20,120.40, 30,185.40 and 10,261.20

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Solution

The fourth proportional to 20,120.40, 30,185.40 and 10,261.20 is: 15,394.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.40 : 30,185.40 = 10,261.20 : x
  2. Step 2: Convert to fraction form
    20,120.40/30,185.40 = 10,261.20/x
  3. Step 3: Cross multiply
    20,120.40x = 30,185.40 × 10,261.20
  4. Step 4: Simplify right side
    20,120.40x = 309,738,426.48
  5. Step 5: Solve for x
    x = 309,738,426.48/20,120.40
  6. Step 6: Final answer
    x = 15,394.25

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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.