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Finding the Fourth Proportional to 393,662.10, 543,297.30 and 221,585.34

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Solution

The fourth proportional to 393,662.10, 543,297.30 and 221,585.34 is: 305,812.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,662.10 : 543,297.30 = 221,585.34 : x
  2. Step 2: Convert to fraction form
    393,662.10/543,297.30 = 221,585.34/x
  3. Step 3: Cross multiply
    393,662.10x = 543,297.30 × 221,585.34
  4. Step 4: Simplify right side
    393,662.10x = 120,386,716,941.58
  5. Step 5: Solve for x
    x = 120,386,716,941.58/393,662.10
  6. Step 6: Final answer
    x = 305,812.31

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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.