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Finding the Fourth Proportional to 112,696.92, 155,728.98 and 80,815.32

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Solution

The fourth proportional to 112,696.92, 155,728.98 and 80,815.32 is: 111,673.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,696.92 : 155,728.98 = 80,815.32 : x
  2. Step 2: Convert to fraction form
    112,696.92/155,728.98 = 80,815.32/x
  3. Step 3: Cross multiply
    112,696.92x = 155,728.98 × 80,815.32
  4. Step 4: Simplify right side
    112,696.92x = 12,585,287,351.97
  5. Step 5: Solve for x
    x = 12,585,287,351.97/112,696.92
  6. Step 6: Final answer
    x = 111,673.75

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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.