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Finding the Fourth Proportional to 118,105.96, 162,989.30 and 72,813.88

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Solution

The fourth proportional to 118,105.96, 162,989.30 and 72,813.88 is: 100,485.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,105.96 : 162,989.30 = 72,813.88 : x
  2. Step 2: Convert to fraction form
    118,105.96/162,989.30 = 72,813.88/x
  3. Step 3: Cross multiply
    118,105.96x = 162,989.30 × 72,813.88
  4. Step 4: Simplify right side
    118,105.96x = 11,867,883,331.48
  5. Step 5: Solve for x
    x = 11,867,883,331.48/118,105.96
  6. Step 6: Final answer
    x = 100,485.05

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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.