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Finding the Fourth Proportional to 108,609.84, 149,879.12 and 63,285

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Solution

The fourth proportional to 108,609.84, 149,879.12 and 63,285 is: 87,331.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,609.84 : 149,879.12 = 63,285 : x
  2. Step 2: Convert to fraction form
    108,609.84/149,879.12 = 63,285/x
  3. Step 3: Cross multiply
    108,609.84x = 149,879.12 × 63,285
  4. Step 4: Simplify right side
    108,609.84x = 9,485,100,109.20
  5. Step 5: Solve for x
    x = 9,485,100,109.20/108,609.84
  6. Step 6: Final answer
    x = 87,331.87

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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.