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Finding the Fourth Proportional to 393,687.50, 543,305.97 and 221,616.59

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Solution

The fourth proportional to 393,687.50, 543,305.97 and 221,616.59 is: 305,840.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,687.50 : 543,305.97 = 221,616.59 : x
  2. Step 2: Convert to fraction form
    393,687.50/543,305.97 = 221,616.59/x
  3. Step 3: Cross multiply
    393,687.50x = 543,305.97 × 221,616.59
  4. Step 4: Simplify right side
    393,687.50x = 120,405,613,681.51
  5. Step 5: Solve for x
    x = 120,405,613,681.51/393,687.50
  6. Step 6: Final answer
    x = 305,840.58

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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.