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Finding the Fourth Proportional to 86,482, 129,723 and 20,818

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Solution

The fourth proportional to 86,482, 129,723 and 20,818 is: 31,227

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,482 : 129,723 = 20,818 : x
  2. Step 2: Convert to fraction form
    86,482/129,723 = 20,818/x
  3. Step 3: Cross multiply
    86,482x = 129,723 × 20,818
  4. Step 4: Simplify right side
    86,482x = 2,700,573,414
  5. Step 5: Solve for x
    x = 2,700,573,414/86,482
  6. Step 6: Final answer
    x = 31,227

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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.