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Finding the Fourth Proportional to 71,790.58, 99,069.96 and 39,959.44

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Solution

The fourth proportional to 71,790.58, 99,069.96 and 39,959.44 is: 55,143.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,790.58 : 99,069.96 = 39,959.44 : x
  2. Step 2: Convert to fraction form
    71,790.58/99,069.96 = 39,959.44/x
  3. Step 3: Cross multiply
    71,790.58x = 99,069.96 × 39,959.44
  4. Step 4: Simplify right side
    71,790.58x = 3,958,780,122.42
  5. Step 5: Solve for x
    x = 3,958,780,122.42/71,790.58
  6. Step 6: Final answer
    x = 55,143.45

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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.