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Finding the Fourth Proportional to 428,856.30, 643,284.45 and 192,660.30

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Solution

The fourth proportional to 428,856.30, 643,284.45 and 192,660.30 is: 288,990.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,856.30 : 643,284.45 = 192,660.30 : x
  2. Step 2: Convert to fraction form
    428,856.30/643,284.45 = 192,660.30/x
  3. Step 3: Cross multiply
    428,856.30x = 643,284.45 × 192,660.30
  4. Step 4: Simplify right side
    428,856.30x = 123,935,375,122.34
  5. Step 5: Solve for x
    x = 123,935,375,122.34/428,856.30
  6. Step 6: Final answer
    x = 288,990.45

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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.