Home / 129,911.87-179,137.89-112,769.21

Finding the Fourth Proportional to 129,911.87, 179,137.89 and 112,769.21

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Solution

The fourth proportional to 129,911.87, 179,137.89 and 112,769.21 is: 155,499.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,911.87 : 179,137.89 = 112,769.21 : x
  2. Step 2: Convert to fraction form
    129,911.87/179,137.89 = 112,769.21/x
  3. Step 3: Cross multiply
    129,911.87x = 179,137.89 × 112,769.21
  4. Step 4: Simplify right side
    129,911.87x = 20,201,238,784.21
  5. Step 5: Solve for x
    x = 20,201,238,784.21/129,911.87
  6. Step 6: Final answer
    x = 155,499.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.