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Finding the Fourth Proportional to 71,191.80, 106,786.32 and 21,272.04

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Solution

The fourth proportional to 71,191.80, 106,786.32 and 21,272.04 is: 31,907.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,191.80 : 106,786.32 = 21,272.04 : x
  2. Step 2: Convert to fraction form
    71,191.80/106,786.32 = 21,272.04/x
  3. Step 3: Cross multiply
    71,191.80x = 106,786.32 × 21,272.04
  4. Step 4: Simplify right side
    71,191.80x = 2,271,562,870.49
  5. Step 5: Solve for x
    x = 2,271,562,870.49/71,191.80
  6. Step 6: Final answer
    x = 31,907.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.