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Finding the Fourth Proportional to 72,910, 100,615.80 and 39,376

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Solution

The fourth proportional to 72,910, 100,615.80 and 39,376 is: 54,338.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,910 : 100,615.80 = 39,376 : x
  2. Step 2: Convert to fraction form
    72,910/100,615.80 = 39,376/x
  3. Step 3: Cross multiply
    72,910x = 100,615.80 × 39,376
  4. Step 4: Simplify right side
    72,910x = 3,961,847,740.80
  5. Step 5: Solve for x
    x = 3,961,847,740.80/72,910
  6. Step 6: Final answer
    x = 54,338.88

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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.