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Finding the Fourth Proportional to 20,561.08, 30,661.25 and 20,374.08

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Solution

The fourth proportional to 20,561.08, 30,661.25 and 20,374.08 is: 30,382.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.08 : 30,661.25 = 20,374.08 : x
  2. Step 2: Convert to fraction form
    20,561.08/30,661.25 = 20,374.08/x
  3. Step 3: Cross multiply
    20,561.08x = 30,661.25 × 20,374.08
  4. Step 4: Simplify right side
    20,561.08x = 624,694,760.40
  5. Step 5: Solve for x
    x = 624,694,760.40/20,561.08
  6. Step 6: Final answer
    x = 30,382.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.