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Finding the Fourth Proportional to 68,681.16, 103,005.09 and 18,761.49

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Solution

The fourth proportional to 68,681.16, 103,005.09 and 18,761.49 is: 28,137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,681.16 : 103,005.09 = 18,761.49 : x
  2. Step 2: Convert to fraction form
    68,681.16/103,005.09 = 18,761.49/x
  3. Step 3: Cross multiply
    68,681.16x = 103,005.09 × 18,761.49
  4. Step 4: Simplify right side
    68,681.16x = 1,932,528,965.98
  5. Step 5: Solve for x
    x = 1,932,528,965.98/68,681.16
  6. Step 6: Final answer
    x = 28,137.69

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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.