Home / 128,935.90-193,403.85-81,696.70

Finding the Fourth Proportional to 128,935.90, 193,403.85 and 81,696.70

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Solution

The fourth proportional to 128,935.90, 193,403.85 and 81,696.70 is: 122,545.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,935.90 : 193,403.85 = 81,696.70 : x
  2. Step 2: Convert to fraction form
    128,935.90/193,403.85 = 81,696.70/x
  3. Step 3: Cross multiply
    128,935.90x = 193,403.85 × 81,696.70
  4. Step 4: Simplify right side
    128,935.90x = 15,800,456,312.30
  5. Step 5: Solve for x
    x = 15,800,456,312.30/128,935.90
  6. Step 6: Final answer
    x = 122,545.05

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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.