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Finding the Fourth Proportional to 428,873.22, 643,519.43 and 303,320.30

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Solution

The fourth proportional to 428,873.22, 643,519.43 and 303,320.30 is: 455,128.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,873.22 : 643,519.43 = 303,320.30 : x
  2. Step 2: Convert to fraction form
    428,873.22/643,519.43 = 303,320.30/x
  3. Step 3: Cross multiply
    428,873.22x = 643,519.43 × 303,320.30
  4. Step 4: Simplify right side
    428,873.22x = 195,192,501,829.23
  5. Step 5: Solve for x
    x = 195,192,501,829.23/428,873.22
  6. Step 6: Final answer
    x = 455,128.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.