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Finding the Fourth Proportional to 68,940.64, 103,410.96 and 19,692.64

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Solution

The fourth proportional to 68,940.64, 103,410.96 and 19,692.64 is: 29,538.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,940.64 : 103,410.96 = 19,692.64 : x
  2. Step 2: Convert to fraction form
    68,940.64/103,410.96 = 19,692.64/x
  3. Step 3: Cross multiply
    68,940.64x = 103,410.96 × 19,692.64
  4. Step 4: Simplify right side
    68,940.64x = 2,036,434,807.33
  5. Step 5: Solve for x
    x = 2,036,434,807.33/68,940.64
  6. Step 6: Final answer
    x = 29,538.96

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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.