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Finding the Fourth Proportional to 428,862.80, 643,294.20 and 192,666.80

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Solution

The fourth proportional to 428,862.80, 643,294.20 and 192,666.80 is: 289,000.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,862.80 : 643,294.20 = 192,666.80 : x
  2. Step 2: Convert to fraction form
    428,862.80/643,294.20 = 192,666.80/x
  3. Step 3: Cross multiply
    428,862.80x = 643,294.20 × 192,666.80
  4. Step 4: Simplify right side
    428,862.80x = 123,941,434,972.56
  5. Step 5: Solve for x
    x = 123,941,434,972.56/428,862.80
  6. Step 6: Final answer
    x = 289,000.20

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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.