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Finding the Fourth Proportional to 716,411.46, 988,640.70 and 394,121.90

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Solution

The fourth proportional to 716,411.46, 988,640.70 and 394,121.90 is: 543,884.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,411.46 : 988,640.70 = 394,121.90 : x
  2. Step 2: Convert to fraction form
    716,411.46/988,640.70 = 394,121.90/x
  3. Step 3: Cross multiply
    716,411.46x = 988,640.70 × 394,121.90
  4. Step 4: Simplify right side
    716,411.46x = 389,644,951,101.33
  5. Step 5: Solve for x
    x = 389,644,951,101.33/716,411.46
  6. Step 6: Final answer
    x = 543,884.31

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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.