Home / 81,629.20-122,443.80-69,819.40

Finding the Fourth Proportional to 81,629.20, 122,443.80 and 69,819.40

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Solution

The fourth proportional to 81,629.20, 122,443.80 and 69,819.40 is: 104,729.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,629.20 : 122,443.80 = 69,819.40 : x
  2. Step 2: Convert to fraction form
    81,629.20/122,443.80 = 69,819.40/x
  3. Step 3: Cross multiply
    81,629.20x = 122,443.80 × 69,819.40
  4. Step 4: Simplify right side
    81,629.20x = 8,548,952,649.72
  5. Step 5: Solve for x
    x = 8,548,952,649.72/81,629.20
  6. Step 6: Final answer
    x = 104,729.10

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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.