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Finding the Fourth Proportional to 71,811.96, 99,104.44 and 39,980.16

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Solution

The fourth proportional to 71,811.96, 99,104.44 and 39,980.16 is: 55,174.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,811.96 : 99,104.44 = 39,980.16 : x
  2. Step 2: Convert to fraction form
    71,811.96/99,104.44 = 39,980.16/x
  3. Step 3: Cross multiply
    71,811.96x = 99,104.44 × 39,980.16
  4. Step 4: Simplify right side
    71,811.96x = 3,962,211,367.91
  5. Step 5: Solve for x
    x = 3,962,211,367.91/71,811.96
  6. Step 6: Final answer
    x = 55,174.81

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Double scale
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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.