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Finding the Fourth Proportional to 78,786.90, 108,706.56 and 50,530.86

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Solution

The fourth proportional to 78,786.90, 108,706.56 and 50,530.86 is: 69,720.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,786.90 : 108,706.56 = 50,530.86 : x
  2. Step 2: Convert to fraction form
    78,786.90/108,706.56 = 50,530.86/x
  3. Step 3: Cross multiply
    78,786.90x = 108,706.56 × 50,530.86
  4. Step 4: Simplify right side
    78,786.90x = 5,493,035,964.44
  5. Step 5: Solve for x
    x = 5,493,035,964.44/78,786.90
  6. Step 6: Final answer
    x = 69,720.17

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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.