Home / 68,085.84-102,129.45-20,708.61

Finding the Fourth Proportional to 68,085.84, 102,129.45 and 20,708.61

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Solution

The fourth proportional to 68,085.84, 102,129.45 and 20,708.61 is: 31,063.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,085.84 : 102,129.45 = 20,708.61 : x
  2. Step 2: Convert to fraction form
    68,085.84/102,129.45 = 20,708.61/x
  3. Step 3: Cross multiply
    68,085.84x = 102,129.45 × 20,708.61
  4. Step 4: Simplify right side
    68,085.84x = 2,114,958,949.56
  5. Step 5: Solve for x
    x = 2,114,958,949.56/68,085.84
  6. Step 6: Final answer
    x = 31,063.12

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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.