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Finding the Fourth Proportional to 71,628.90, 107,368.62 and 39,992.59

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Solution

The fourth proportional to 71,628.90, 107,368.62 and 39,992.59 is: 59,947.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,628.90 : 107,368.62 = 39,992.59 : x
  2. Step 2: Convert to fraction form
    71,628.90/107,368.62 = 39,992.59/x
  3. Step 3: Cross multiply
    71,628.90x = 107,368.62 × 39,992.59
  4. Step 4: Simplify right side
    71,628.90x = 4,293,949,198.53
  5. Step 5: Solve for x
    x = 4,293,949,198.53/71,628.90
  6. Step 6: Final answer
    x = 59,947.16

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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.