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Finding the Fourth Proportional to 78,971.66, 108,980.94 and 43,161.66

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Solution

The fourth proportional to 78,971.66, 108,980.94 and 43,161.66 is: 59,563.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,971.66 : 108,980.94 = 43,161.66 : x
  2. Step 2: Convert to fraction form
    78,971.66/108,980.94 = 43,161.66/x
  3. Step 3: Cross multiply
    78,971.66x = 108,980.94 × 43,161.66
  4. Step 4: Simplify right side
    78,971.66x = 4,703,798,440.62
  5. Step 5: Solve for x
    x = 4,703,798,440.62/78,971.66
  6. Step 6: Final answer
    x = 59,563.12

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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.