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Finding the Fourth Proportional to 394,176.38, 543,963.40 and 215,328.38

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Solution

The fourth proportional to 394,176.38, 543,963.40 and 215,328.38 is: 297,153.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,176.38 : 543,963.40 = 215,328.38 : x
  2. Step 2: Convert to fraction form
    394,176.38/543,963.40 = 215,328.38/x
  3. Step 3: Cross multiply
    394,176.38x = 543,963.40 × 215,328.38
  4. Step 4: Simplify right side
    394,176.38x = 117,130,754,443.15
  5. Step 5: Solve for x
    x = 117,130,754,443.15/394,176.38
  6. Step 6: Final answer
    x = 297,153.16

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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.