Home / 128,775.08-177,719.46-81,069.32

Finding the Fourth Proportional to 128,775.08, 177,719.46 and 81,069.32

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Solution

The fourth proportional to 128,775.08, 177,719.46 and 81,069.32 is: 111,881.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,775.08 : 177,719.46 = 81,069.32 : x
  2. Step 2: Convert to fraction form
    128,775.08/177,719.46 = 81,069.32/x
  3. Step 3: Cross multiply
    128,775.08x = 177,719.46 × 81,069.32
  4. Step 4: Simplify right side
    128,775.08x = 14,407,595,772.97
  5. Step 5: Solve for x
    x = 14,407,595,772.97/128,775.08
  6. Step 6: Final answer
    x = 111,881.86

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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.