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Finding the Fourth Proportional to 205,696.56, 308,225.70 and 142,639.68

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Solution

The fourth proportional to 205,696.56, 308,225.70 and 142,639.68 is: 213,738.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,696.56 : 308,225.70 = 142,639.68 : x
  2. Step 2: Convert to fraction form
    205,696.56/308,225.70 = 142,639.68/x
  3. Step 3: Cross multiply
    205,696.56x = 308,225.70 × 142,639.68
  4. Step 4: Simplify right side
    205,696.56x = 43,965,215,215.78
  5. Step 5: Solve for x
    x = 43,965,215,215.78/205,696.56
  6. Step 6: Final answer
    x = 213,738.21

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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.