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Finding the Fourth Proportional to 71,645.67, 98,869 and 39,813.75

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Solution

The fourth proportional to 71,645.67, 98,869 and 39,813.75 is: 54,941.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,645.67 : 98,869 = 39,813.75 : x
  2. Step 2: Convert to fraction form
    71,645.67/98,869 = 39,813.75/x
  3. Step 3: Cross multiply
    71,645.67x = 98,869 × 39,813.75
  4. Step 4: Simplify right side
    71,645.67x = 3,936,345,648.75
  5. Step 5: Solve for x
    x = 3,936,345,648.75/71,645.67
  6. Step 6: Final answer
    x = 54,941.85

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1.5x scale

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.