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Finding the Fourth Proportional to 68,919.12, 103,395.84 and 19,671.12

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Solution

The fourth proportional to 68,919.12, 103,395.84 and 19,671.12 is: 29,511.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,919.12 : 103,395.84 = 19,671.12 : x
  2. Step 2: Convert to fraction form
    68,919.12/103,395.84 = 19,671.12/x
  3. Step 3: Cross multiply
    68,919.12x = 103,395.84 × 19,671.12
  4. Step 4: Simplify right side
    68,919.12x = 2,033,911,976.14
  5. Step 5: Solve for x
    x = 2,033,911,976.14/68,919.12
  6. Step 6: Final answer
    x = 29,511.58

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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.