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Finding the Fourth Proportional to 68,861.88, 103,280.40 and 18,935.51

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Solution

The fourth proportional to 68,861.88, 103,280.40 and 18,935.51 is: 28,399.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,861.88 : 103,280.40 = 18,935.51 : x
  2. Step 2: Convert to fraction form
    68,861.88/103,280.40 = 18,935.51/x
  3. Step 3: Cross multiply
    68,861.88x = 103,280.40 × 18,935.51
  4. Step 4: Simplify right side
    68,861.88x = 1,955,666,530.60
  5. Step 5: Solve for x
    x = 1,955,666,530.60/68,861.88
  6. Step 6: Final answer
    x = 28,399.84

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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.