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Finding the Fourth Proportional to 108,388.45, 149,636.34 and 65,378.80

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Solution

The fourth proportional to 108,388.45, 149,636.34 and 65,378.80 is: 90,259.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,388.45 : 149,636.34 = 65,378.80 : x
  2. Step 2: Convert to fraction form
    108,388.45/149,636.34 = 65,378.80/x
  3. Step 3: Cross multiply
    108,388.45x = 149,636.34 × 65,378.80
  4. Step 4: Simplify right side
    108,388.45x = 9,783,043,507.06
  5. Step 5: Solve for x
    x = 9,783,043,507.06/108,388.45
  6. Step 6: Final answer
    x = 90,259.09

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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.