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Finding the Fourth Proportional to 78,940.46, 108,936.55 and 43,129.70

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Solution

The fourth proportional to 78,940.46, 108,936.55 and 43,129.70 is: 59,518.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,940.46 : 108,936.55 = 43,129.70 : x
  2. Step 2: Convert to fraction form
    78,940.46/108,936.55 = 43,129.70/x
  3. Step 3: Cross multiply
    78,940.46x = 108,936.55 × 43,129.70
  4. Step 4: Simplify right side
    78,940.46x = 4,698,400,612.71
  5. Step 5: Solve for x
    x = 4,698,400,612.71/78,940.46
  6. Step 6: Final answer
    x = 59,518.28

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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.