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Finding the Fourth Proportional to 81,745.92, 112,812.48 and 49,929.12

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Solution

The fourth proportional to 81,745.92, 112,812.48 and 49,929.12 is: 68,904.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,745.92 : 112,812.48 = 49,929.12 : x
  2. Step 2: Convert to fraction form
    81,745.92/112,812.48 = 49,929.12/x
  3. Step 3: Cross multiply
    81,745.92x = 112,812.48 × 49,929.12
  4. Step 4: Simplify right side
    81,745.92x = 5,632,627,851.42
  5. Step 5: Solve for x
    x = 5,632,627,851.42/81,745.92
  6. Step 6: Final answer
    x = 68,904.09

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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.