Home / 128,830-177,724.92-91,125.04

Finding the Fourth Proportional to 128,830, 177,724.92 and 91,125.04

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Solution

The fourth proportional to 128,830, 177,724.92 and 91,125.04 is: 125,709.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,830 : 177,724.92 = 91,125.04 : x
  2. Step 2: Convert to fraction form
    128,830/177,724.92 = 91,125.04/x
  3. Step 3: Cross multiply
    128,830x = 177,724.92 × 91,125.04
  4. Step 4: Simplify right side
    128,830x = 16,195,190,444.00
  5. Step 5: Solve for x
    x = 16,195,190,444.00/128,830
  6. Step 6: Final answer
    x = 125,709.78

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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.