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Finding the Fourth Proportional to 72,928.41, 100,640.61 and 40,662.65

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Solution

The fourth proportional to 72,928.41, 100,640.61 and 40,662.65 is: 56,114.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.41 : 100,640.61 = 40,662.65 : x
  2. Step 2: Convert to fraction form
    72,928.41/100,640.61 = 40,662.65/x
  3. Step 3: Cross multiply
    72,928.41x = 100,640.61 × 40,662.65
  4. Step 4: Simplify right side
    72,928.41x = 4,092,313,397.01
  5. Step 5: Solve for x
    x = 4,092,313,397.01/72,928.41
  6. Step 6: Final answer
    x = 56,114.12

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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.