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Finding the Fourth Proportional to 68,912.20, 103,392.60 and 66,482.20

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Solution

The fourth proportional to 68,912.20, 103,392.60 and 66,482.20 is: 99,746.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,912.20 : 103,392.60 = 66,482.20 : x
  2. Step 2: Convert to fraction form
    68,912.20/103,392.60 = 66,482.20/x
  3. Step 3: Cross multiply
    68,912.20x = 103,392.60 × 66,482.20
  4. Step 4: Simplify right side
    68,912.20x = 6,873,767,511.72
  5. Step 5: Solve for x
    x = 6,873,767,511.72/68,912.20
  6. Step 6: Final answer
    x = 99,746.74

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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.