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Finding the Fourth Proportional to 71,608.12, 98,817.78 and 39,775.96

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Solution

The fourth proportional to 71,608.12, 98,817.78 and 39,775.96 is: 54,890.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,608.12 : 98,817.78 = 39,775.96 : x
  2. Step 2: Convert to fraction form
    71,608.12/98,817.78 = 39,775.96/x
  3. Step 3: Cross multiply
    71,608.12x = 98,817.78 × 39,775.96
  4. Step 4: Simplify right side
    71,608.12x = 3,930,572,064.57
  5. Step 5: Solve for x
    x = 3,930,572,064.57/71,608.12
  6. Step 6: Final answer
    x = 54,890.03

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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.