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Finding the Fourth Proportional to 71,790.44, 99,070.81 and 39,958.66

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Solution

The fourth proportional to 71,790.44, 99,070.81 and 39,958.66 is: 55,142.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,790.44 : 99,070.81 = 39,958.66 : x
  2. Step 2: Convert to fraction form
    71,790.44/99,070.81 = 39,958.66/x
  3. Step 3: Cross multiply
    71,790.44x = 99,070.81 × 39,958.66
  4. Step 4: Simplify right side
    71,790.44x = 3,958,736,317.36
  5. Step 5: Solve for x
    x = 3,958,736,317.36/71,790.44
  6. Step 6: Final answer
    x = 55,142.95

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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.