Home / 128,399.28-177,247.75-76,734.61

Finding the Fourth Proportional to 128,399.28, 177,247.75 and 76,734.61

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Solution

The fourth proportional to 128,399.28, 177,247.75 and 76,734.61 is: 105,927.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399.28 : 177,247.75 = 76,734.61 : x
  2. Step 2: Convert to fraction form
    128,399.28/177,247.75 = 76,734.61/x
  3. Step 3: Cross multiply
    128,399.28x = 177,247.75 × 76,734.61
  4. Step 4: Simplify right side
    128,399.28x = 13,601,036,969.63
  5. Step 5: Solve for x
    x = 13,601,036,969.63/128,399.28
  6. Step 6: Final answer
    x = 105,927.67

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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.