Home / 128,919.76-177,577.80-91,129.04

Finding the Fourth Proportional to 128,919.76, 177,577.80 and 91,129.04

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Solution

The fourth proportional to 128,919.76, 177,577.80 and 91,129.04 is: 125,523.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,919.76 : 177,577.80 = 91,129.04 : x
  2. Step 2: Convert to fraction form
    128,919.76/177,577.80 = 91,129.04/x
  3. Step 3: Cross multiply
    128,919.76x = 177,577.80 × 91,129.04
  4. Step 4: Simplify right side
    128,919.76x = 16,182,494,439.31
  5. Step 5: Solve for x
    x = 16,182,494,439.31/128,919.76
  6. Step 6: Final answer
    x = 125,523.77

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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.