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Finding the Fourth Proportional to 111,912.80, 167,869.20 and 99,665.60

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Solution

The fourth proportional to 111,912.80, 167,869.20 and 99,665.60 is: 149,498.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,912.80 : 167,869.20 = 99,665.60 : x
  2. Step 2: Convert to fraction form
    111,912.80/167,869.20 = 99,665.60/x
  3. Step 3: Cross multiply
    111,912.80x = 167,869.20 × 99,665.60
  4. Step 4: Simplify right side
    111,912.80x = 16,730,784,539.52
  5. Step 5: Solve for x
    x = 16,730,784,539.52/111,912.80
  6. Step 6: Final answer
    x = 149,498.40

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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.