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Finding the Fourth Proportional to 428,937.80, 642,969.30 and 251,353.40

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Solution

The fourth proportional to 428,937.80, 642,969.30 and 251,353.40 is: 376,773.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,937.80 : 642,969.30 = 251,353.40 : x
  2. Step 2: Convert to fraction form
    428,937.80/642,969.30 = 251,353.40/x
  3. Step 3: Cross multiply
    428,937.80x = 642,969.30 × 251,353.40
  4. Step 4: Simplify right side
    428,937.80x = 161,612,519,650.62
  5. Step 5: Solve for x
    x = 161,612,519,650.62/428,937.80
  6. Step 6: Final answer
    x = 376,773.79

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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.