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Finding the Fourth Proportional to 111,021.20, 166,531.80 and 99,357.20

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Solution

The fourth proportional to 111,021.20, 166,531.80 and 99,357.20 is: 149,035.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,021.20 : 166,531.80 = 99,357.20 : x
  2. Step 2: Convert to fraction form
    111,021.20/166,531.80 = 99,357.20/x
  3. Step 3: Cross multiply
    111,021.20x = 166,531.80 × 99,357.20
  4. Step 4: Simplify right side
    111,021.20x = 16,546,133,358.96
  5. Step 5: Solve for x
    x = 16,546,133,358.96/111,021.20
  6. Step 6: Final answer
    x = 149,035.80

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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.