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Finding the Fourth Proportional to 108,961.32, 163,288.80 and 86,675.88

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Solution

The fourth proportional to 108,961.32, 163,288.80 and 86,675.88 is: 129,891.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,961.32 : 163,288.80 = 86,675.88 : x
  2. Step 2: Convert to fraction form
    108,961.32/163,288.80 = 86,675.88/x
  3. Step 3: Cross multiply
    108,961.32x = 163,288.80 × 86,675.88
  4. Step 4: Simplify right side
    108,961.32x = 14,153,200,434.14
  5. Step 5: Solve for x
    x = 14,153,200,434.14/108,961.32
  6. Step 6: Final answer
    x = 129,891.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.