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Finding the Fourth Proportional to 68,039.95, 102,048.41 and 20,643.62

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Solution

The fourth proportional to 68,039.95, 102,048.41 and 20,643.62 is: 30,961.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,039.95 : 102,048.41 = 20,643.62 : x
  2. Step 2: Convert to fraction form
    68,039.95/102,048.41 = 20,643.62/x
  3. Step 3: Cross multiply
    68,039.95x = 102,048.41 × 20,643.62
  4. Step 4: Simplify right side
    68,039.95x = 2,106,648,217.40
  5. Step 5: Solve for x
    x = 2,106,648,217.40/68,039.95
  6. Step 6: Final answer
    x = 30,961.93

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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.