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Finding the Fourth Proportional to 39,482, 54,485.16 and 21,818

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Solution

The fourth proportional to 39,482, 54,485.16 and 21,818 is: 30,108.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,482 : 54,485.16 = 21,818 : x
  2. Step 2: Convert to fraction form
    39,482/54,485.16 = 21,818/x
  3. Step 3: Cross multiply
    39,482x = 54,485.16 × 21,818
  4. Step 4: Simplify right side
    39,482x = 1,188,757,220.88
  5. Step 5: Solve for x
    x = 1,188,757,220.88/39,482
  6. Step 6: Final answer
    x = 30,108.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.