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Finding the Fourth Proportional to 72,751.24, 100,396.78 and 40,920.20

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Solution

The fourth proportional to 72,751.24, 100,396.78 and 40,920.20 is: 56,469.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,751.24 : 100,396.78 = 40,920.20 : x
  2. Step 2: Convert to fraction form
    72,751.24/100,396.78 = 40,920.20/x
  3. Step 3: Cross multiply
    72,751.24x = 100,396.78 × 40,920.20
  4. Step 4: Simplify right side
    72,751.24x = 4,108,256,316.96
  5. Step 5: Solve for x
    x = 4,108,256,316.96/72,751.24
  6. Step 6: Final answer
    x = 56,469.91

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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.