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Finding the Fourth Proportional to 393,781.79, 543,377.27 and 221,696.64

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Solution

The fourth proportional to 393,781.79, 543,377.27 and 221,696.64 is: 305,917.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,781.79 : 543,377.27 = 221,696.64 : x
  2. Step 2: Convert to fraction form
    393,781.79/543,377.27 = 221,696.64/x
  3. Step 3: Cross multiply
    393,781.79x = 543,377.27 × 221,696.64
  4. Step 4: Simplify right side
    393,781.79x = 120,464,913,902.89
  5. Step 5: Solve for x
    x = 120,464,913,902.89/393,781.79
  6. Step 6: Final answer
    x = 305,917.94

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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.