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Finding the Fourth Proportional to 71,809.92, 99,100.96 and 39,980.84

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Solution

The fourth proportional to 71,809.92, 99,100.96 and 39,980.84 is: 55,175.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,809.92 : 99,100.96 = 39,980.84 : x
  2. Step 2: Convert to fraction form
    71,809.92/99,100.96 = 39,980.84/x
  3. Step 3: Cross multiply
    71,809.92x = 99,100.96 × 39,980.84
  4. Step 4: Simplify right side
    71,809.92x = 3,962,139,625.61
  5. Step 5: Solve for x
    x = 3,962,139,625.61/71,809.92
  6. Step 6: Final answer
    x = 55,175.38

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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.