Home / 81,129.20-121,604.70-28,511.60

Finding the Fourth Proportional to 81,129.20, 121,604.70 and 28,511.60

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Solution

The fourth proportional to 81,129.20, 121,604.70 and 28,511.60 is: 42,736.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,129.20 : 121,604.70 = 28,511.60 : x
  2. Step 2: Convert to fraction form
    81,129.20/121,604.70 = 28,511.60/x
  3. Step 3: Cross multiply
    81,129.20x = 121,604.70 × 28,511.60
  4. Step 4: Simplify right side
    81,129.20x = 3,467,144,564.52
  5. Step 5: Solve for x
    x = 3,467,144,564.52/81,129.20
  6. Step 6: Final answer
    x = 42,736.09

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1.5x scale

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.