Home / 128,379.44-177,165.96-71,789.60

Finding the Fourth Proportional to 128,379.44, 177,165.96 and 71,789.60

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Solution

The fourth proportional to 128,379.44, 177,165.96 and 71,789.60 is: 99,070.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379.44 : 177,165.96 = 71,789.60 : x
  2. Step 2: Convert to fraction form
    128,379.44/177,165.96 = 71,789.60/x
  3. Step 3: Cross multiply
    128,379.44x = 177,165.96 × 71,789.60
  4. Step 4: Simplify right side
    128,379.44x = 12,718,673,402.02
  5. Step 5: Solve for x
    x = 12,718,673,402.02/128,379.44
  6. Step 6: Final answer
    x = 99,070.95

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1.5x scale

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.