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Finding the Fourth Proportional to 68,841.78, 103,263.81 and 18,921.57

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Solution

The fourth proportional to 68,841.78, 103,263.81 and 18,921.57 is: 28,382.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,841.78 : 103,263.81 = 18,921.57 : x
  2. Step 2: Convert to fraction form
    68,841.78/103,263.81 = 18,921.57/x
  3. Step 3: Cross multiply
    68,841.78x = 103,263.81 × 18,921.57
  4. Step 4: Simplify right side
    68,841.78x = 1,953,913,409.38
  5. Step 5: Solve for x
    x = 1,953,913,409.38/68,841.78
  6. Step 6: Final answer
    x = 28,382.67

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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.