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Finding the Fourth Proportional to 393,711.72, 543,339.84 and 221,688.84

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Solution

The fourth proportional to 393,711.72, 543,339.84 and 221,688.84 is: 305,940.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,711.72 : 543,339.84 = 221,688.84 : x
  2. Step 2: Convert to fraction form
    393,711.72/543,339.84 = 221,688.84/x
  3. Step 3: Cross multiply
    393,711.72x = 543,339.84 × 221,688.84
  4. Step 4: Simplify right side
    393,711.72x = 120,452,378,855.39
  5. Step 5: Solve for x
    x = 120,452,378,855.39/393,711.72
  6. Step 6: Final answer
    x = 305,940.55

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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.