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Finding the Fourth Proportional to 428,775.12, 643,560.12 and 218,570.96

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Solution

The fourth proportional to 428,775.12, 643,560.12 and 218,570.96 is: 328,059.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,775.12 : 643,560.12 = 218,570.96 : x
  2. Step 2: Convert to fraction form
    428,775.12/643,560.12 = 218,570.96/x
  3. Step 3: Cross multiply
    428,775.12x = 643,560.12 × 218,570.96
  4. Step 4: Simplify right side
    428,775.12x = 140,663,553,246.12
  5. Step 5: Solve for x
    x = 140,663,553,246.12/428,775.12
  6. Step 6: Final answer
    x = 328,059.04

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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.