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Finding the Fourth Proportional to 393,787.04, 543,384.50 and 221,701.91

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Solution

The fourth proportional to 393,787.04, 543,384.50 and 221,701.91 is: 305,925.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,787.04 : 543,384.50 = 221,701.91 : x
  2. Step 2: Convert to fraction form
    393,787.04/543,384.50 = 221,701.91/x
  3. Step 3: Cross multiply
    393,787.04x = 543,384.50 × 221,701.91
  4. Step 4: Simplify right side
    393,787.04x = 120,469,377,688.96
  5. Step 5: Solve for x
    x = 120,469,377,688.96/393,787.04
  6. Step 6: Final answer
    x = 305,925.20

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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.