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Finding the Fourth Proportional to 128,659.61, 177,529.59 and 80,879.12

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Solution

The fourth proportional to 128,659.61, 177,529.59 and 80,879.12 is: 111,600.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,659.61 : 177,529.59 = 80,879.12 : x
  2. Step 2: Convert to fraction form
    128,659.61/177,529.59 = 80,879.12/x
  3. Step 3: Cross multiply
    128,659.61x = 177,529.59 × 80,879.12
  4. Step 4: Simplify right side
    128,659.61x = 14,358,437,486.56
  5. Step 5: Solve for x
    x = 14,358,437,486.56/128,659.61
  6. Step 6: Final answer
    x = 111,600.20

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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.