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Finding the Fourth Proportional to 72,928.17, 100,640.85 and 39,394.17

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Solution

The fourth proportional to 72,928.17, 100,640.85 and 39,394.17 is: 54,363.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.17 : 100,640.85 = 39,394.17 : x
  2. Step 2: Convert to fraction form
    72,928.17/100,640.85 = 39,394.17/x
  3. Step 3: Cross multiply
    72,928.17x = 100,640.85 × 39,394.17
  4. Step 4: Simplify right side
    72,928.17x = 3,964,663,221.56
  5. Step 5: Solve for x
    x = 3,964,663,221.56/72,928.17
  6. Step 6: Final answer
    x = 54,363.95

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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.