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Finding the Fourth Proportional to 643,138.38, 887,517.41 and 356,652.32

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Solution

The fourth proportional to 643,138.38, 887,517.41 and 356,652.32 is: 492,172.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,138.38 : 887,517.41 = 356,652.32 : x
  2. Step 2: Convert to fraction form
    643,138.38/887,517.41 = 356,652.32/x
  3. Step 3: Cross multiply
    643,138.38x = 887,517.41 × 356,652.32
  4. Step 4: Simplify right side
    643,138.38x = 316,535,137,096.04
  5. Step 5: Solve for x
    x = 316,535,137,096.04/643,138.38
  6. Step 6: Final answer
    x = 492,172.68

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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.