Home / 128,321.40-177,083.99-71,732.78

Finding the Fourth Proportional to 128,321.40, 177,083.99 and 71,732.78

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Solution

The fourth proportional to 128,321.40, 177,083.99 and 71,732.78 is: 98,991.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,321.40 : 177,083.99 = 71,732.78 : x
  2. Step 2: Convert to fraction form
    128,321.40/177,083.99 = 71,732.78/x
  3. Step 3: Cross multiply
    128,321.40x = 177,083.99 × 71,732.78
  4. Step 4: Simplify right side
    128,321.40x = 12,702,726,896.19
  5. Step 5: Solve for x
    x = 12,702,726,896.19/128,321.40
  6. Step 6: Final answer
    x = 98,991.49

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1.5x scale

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.