Home / 128,711.68-177,562.08-80,991.36

Finding the Fourth Proportional to 128,711.68, 177,562.08 and 80,991.36

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Solution

The fourth proportional to 128,711.68, 177,562.08 and 80,991.36 is: 111,730.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,711.68 : 177,562.08 = 80,991.36 : x
  2. Step 2: Convert to fraction form
    128,711.68/177,562.08 = 80,991.36/x
  3. Step 3: Cross multiply
    128,711.68x = 177,562.08 × 80,991.36
  4. Step 4: Simplify right side
    128,711.68x = 14,380,994,343.63
  5. Step 5: Solve for x
    x = 14,380,994,343.63/128,711.68
  6. Step 6: Final answer
    x = 111,730.30

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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.