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Finding the Fourth Proportional to 71,645.90, 98,866.82 and 39,812.90

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Solution

The fourth proportional to 71,645.90, 98,866.82 and 39,812.90 is: 54,939.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,645.90 : 98,866.82 = 39,812.90 : x
  2. Step 2: Convert to fraction form
    71,645.90/98,866.82 = 39,812.90/x
  3. Step 3: Cross multiply
    71,645.90x = 98,866.82 × 39,812.90
  4. Step 4: Simplify right side
    71,645.90x = 3,936,174,817.98
  5. Step 5: Solve for x
    x = 3,936,174,817.98/71,645.90
  6. Step 6: Final answer
    x = 54,939.29

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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.