Home / 128,986.75-193,378.33-81,501.78

Finding the Fourth Proportional to 128,986.75, 193,378.33 and 81,501.78

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Solution

The fourth proportional to 128,986.75, 193,378.33 and 81,501.78 is: 122,188.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.75 : 193,378.33 = 81,501.78 : x
  2. Step 2: Convert to fraction form
    128,986.75/193,378.33 = 81,501.78/x
  3. Step 3: Cross multiply
    128,986.75x = 193,378.33 × 81,501.78
  4. Step 4: Simplify right side
    128,986.75x = 15,760,678,108.43
  5. Step 5: Solve for x
    x = 15,760,678,108.43/128,986.75
  6. Step 6: Final answer
    x = 122,188.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.