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Finding the Fourth Proportional to 128,083.70, 192,125.55 and 81,370.10

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Solution

The fourth proportional to 128,083.70, 192,125.55 and 81,370.10 is: 122,055.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,083.70 : 192,125.55 = 81,370.10 : x
  2. Step 2: Convert to fraction form
    128,083.70/192,125.55 = 81,370.10/x
  3. Step 3: Cross multiply
    128,083.70x = 192,125.55 × 81,370.10
  4. Step 4: Simplify right side
    128,083.70x = 15,633,275,216.06
  5. Step 5: Solve for x
    x = 15,633,275,216.06/128,083.70
  6. Step 6: Final answer
    x = 122,055.15

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1.5x scale

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.