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Finding the Fourth Proportional to 393,678.50, 543,293.53 and 221,607.56

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Solution

The fourth proportional to 393,678.50, 543,293.53 and 221,607.56 is: 305,828.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,678.50 : 543,293.53 = 221,607.56 : x
  2. Step 2: Convert to fraction form
    393,678.50/543,293.53 = 221,607.56/x
  3. Step 3: Cross multiply
    393,678.50x = 543,293.53 × 221,607.56
  4. Step 4: Simplify right side
    393,678.50x = 120,397,954,351.30
  5. Step 5: Solve for x
    x = 120,397,954,351.30/393,678.50
  6. Step 6: Final answer
    x = 305,828.12

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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.