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Finding the Fourth Proportional to 71,690.40, 107,535.60 and 68,968.80

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Solution

The fourth proportional to 71,690.40, 107,535.60 and 68,968.80 is: 103,453.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,690.40 : 107,535.60 = 68,968.80 : x
  2. Step 2: Convert to fraction form
    71,690.40/107,535.60 = 68,968.80/x
  3. Step 3: Cross multiply
    71,690.40x = 107,535.60 × 68,968.80
  4. Step 4: Simplify right side
    71,690.40x = 7,416,601,289.28
  5. Step 5: Solve for x
    x = 7,416,601,289.28/71,690.40
  6. Step 6: Final answer
    x = 103,453.20

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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.