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Finding the Fourth Proportional to 427,490.43, 640,940.39 and 187,489.05

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Solution

The fourth proportional to 427,490.43, 640,940.39 and 187,489.05 is: 281,104.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,490.43 : 640,940.39 = 187,489.05 : x
  2. Step 2: Convert to fraction form
    427,490.43/640,940.39 = 187,489.05/x
  3. Step 3: Cross multiply
    427,490.43x = 640,940.39 × 187,489.05
  4. Step 4: Simplify right side
    427,490.43x = 120,169,303,890.28
  5. Step 5: Solve for x
    x = 120,169,303,890.28/427,490.43
  6. Step 6: Final answer
    x = 281,104.08

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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.