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Finding the Fourth Proportional to 74,688.60, 111,708.90 and 66,847.80

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Solution

The fourth proportional to 74,688.60, 111,708.90 and 66,847.80 is: 99,981.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,688.60 : 111,708.90 = 66,847.80 : x
  2. Step 2: Convert to fraction form
    74,688.60/111,708.90 = 66,847.80/x
  3. Step 3: Cross multiply
    74,688.60x = 111,708.90 × 66,847.80
  4. Step 4: Simplify right side
    74,688.60x = 7,467,494,205.42
  5. Step 5: Solve for x
    x = 7,467,494,205.42/74,688.60
  6. Step 6: Final answer
    x = 99,981.71

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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.