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Finding the Fourth Proportional to 74,139.60, 111,063.60 and 68,890.80

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Solution

The fourth proportional to 74,139.60, 111,063.60 and 68,890.80 is: 103,200.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,139.60 : 111,063.60 = 68,890.80 : x
  2. Step 2: Convert to fraction form
    74,139.60/111,063.60 = 68,890.80/x
  3. Step 3: Cross multiply
    74,139.60x = 111,063.60 × 68,890.80
  4. Step 4: Simplify right side
    74,139.60x = 7,651,260,254.88
  5. Step 5: Solve for x
    x = 7,651,260,254.88/74,139.60
  6. Step 6: Final answer
    x = 103,200.72

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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.