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Finding the Fourth Proportional to 645,618.60, 890,589.60 and 387,429.48

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Solution

The fourth proportional to 645,618.60, 890,589.60 and 387,429.48 is: 534,434.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,618.60 : 890,589.60 = 387,429.48 : x
  2. Step 2: Convert to fraction form
    645,618.60/890,589.60 = 387,429.48/x
  3. Step 3: Cross multiply
    645,618.60x = 890,589.60 × 387,429.48
  4. Step 4: Simplify right side
    645,618.60x = 345,040,665,621.41
  5. Step 5: Solve for x
    x = 345,040,665,621.41/645,618.60
  6. Step 6: Final answer
    x = 534,434.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.