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Finding the Fourth Proportional to 72,156, 108,278.28 and 30,603

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Solution

The fourth proportional to 72,156, 108,278.28 and 30,603 is: 45,923.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,156 : 108,278.28 = 30,603 : x
  2. Step 2: Convert to fraction form
    72,156/108,278.28 = 30,603/x
  3. Step 3: Cross multiply
    72,156x = 108,278.28 × 30,603
  4. Step 4: Simplify right side
    72,156x = 3,313,640,202.84
  5. Step 5: Solve for x
    x = 3,313,640,202.84/72,156
  6. Step 6: Final answer
    x = 45,923.28

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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.