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Finding the Fourth Proportional to 111,388.24, 166,786.76 and 87,130.80

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Solution

The fourth proportional to 111,388.24, 166,786.76 and 87,130.80 is: 130,464.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,388.24 : 166,786.76 = 87,130.80 : x
  2. Step 2: Convert to fraction form
    111,388.24/166,786.76 = 87,130.80/x
  3. Step 3: Cross multiply
    111,388.24x = 166,786.76 × 87,130.80
  4. Step 4: Simplify right side
    111,388.24x = 14,532,263,828.21
  5. Step 5: Solve for x
    x = 14,532,263,828.21/111,388.24
  6. Step 6: Final answer
    x = 130,464.97

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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.