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Finding the Fourth Proportional to 68,701.95, 103,067.64 and 21,316.03

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Solution

The fourth proportional to 68,701.95, 103,067.64 and 21,316.03 is: 31,978.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,701.95 : 103,067.64 = 21,316.03 : x
  2. Step 2: Convert to fraction form
    68,701.95/103,067.64 = 21,316.03/x
  3. Step 3: Cross multiply
    68,701.95x = 103,067.64 × 21,316.03
  4. Step 4: Simplify right side
    68,701.95x = 2,196,992,648.60
  5. Step 5: Solve for x
    x = 2,196,992,648.60/68,701.95
  6. Step 6: Final answer
    x = 31,978.61

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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.