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Finding the Fourth Proportional to 111,939.90, 168,001.65 and 111,065.10

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Solution

The fourth proportional to 111,939.90, 168,001.65 and 111,065.10 is: 166,688.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,939.90 : 168,001.65 = 111,065.10 : x
  2. Step 2: Convert to fraction form
    111,939.90/168,001.65 = 111,065.10/x
  3. Step 3: Cross multiply
    111,939.90x = 168,001.65 × 111,065.10
  4. Step 4: Simplify right side
    111,939.90x = 18,659,120,057.42
  5. Step 5: Solve for x
    x = 18,659,120,057.42/111,939.90
  6. Step 6: Final answer
    x = 166,688.73

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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.