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Finding the Fourth Proportional to 393,611.20, 543,138.60 and 221,495.92

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Solution

The fourth proportional to 393,611.20, 543,138.60 and 221,495.92 is: 305,639.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,611.20 : 543,138.60 = 221,495.92 : x
  2. Step 2: Convert to fraction form
    393,611.20/543,138.60 = 221,495.92/x
  3. Step 3: Cross multiply
    393,611.20x = 543,138.60 × 221,495.92
  4. Step 4: Simplify right side
    393,611.20x = 120,302,983,894.51
  5. Step 5: Solve for x
    x = 120,302,983,894.51/393,611.20
  6. Step 6: Final answer
    x = 305,639.13

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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.