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Finding the Fourth Proportional to 394,728, 544,737.60 and 215,880

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Solution

The fourth proportional to 394,728, 544,737.60 and 215,880 is: 297,921.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,728 : 544,737.60 = 215,880 : x
  2. Step 2: Convert to fraction form
    394,728/544,737.60 = 215,880/x
  3. Step 3: Cross multiply
    394,728x = 544,737.60 × 215,880
  4. Step 4: Simplify right side
    394,728x = 117,597,953,088
  5. Step 5: Solve for x
    x = 117,597,953,088/394,728
  6. Step 6: Final answer
    x = 297,921.49

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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.