Home / 128,410.20-177,211.44-79,362.72

Finding the Fourth Proportional to 128,410.20, 177,211.44 and 79,362.72

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Solution

The fourth proportional to 128,410.20, 177,211.44 and 79,362.72 is: 109,523.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,410.20 : 177,211.44 = 79,362.72 : x
  2. Step 2: Convert to fraction form
    128,410.20/177,211.44 = 79,362.72/x
  3. Step 3: Cross multiply
    128,410.20x = 177,211.44 × 79,362.72
  4. Step 4: Simplify right side
    128,410.20x = 14,063,981,893.52
  5. Step 5: Solve for x
    x = 14,063,981,893.52/128,410.20
  6. Step 6: Final answer
    x = 109,523.87

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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.