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Finding the Fourth Proportional to 428,856.80, 643,285.20 and 192,660.80

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Solution

The fourth proportional to 428,856.80, 643,285.20 and 192,660.80 is: 288,991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,856.80 : 643,285.20 = 192,660.80 : x
  2. Step 2: Convert to fraction form
    428,856.80/643,285.20 = 192,660.80/x
  3. Step 3: Cross multiply
    428,856.80x = 643,285.20 × 192,660.80
  4. Step 4: Simplify right side
    428,856.80x = 123,935,841,260.16
  5. Step 5: Solve for x
    x = 123,935,841,260.16/428,856.80
  6. Step 6: Final answer
    x = 288,991.20

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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.