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Finding the Fourth Proportional to 108,063.72, 161,920.62 and 81,819.72

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Solution

The fourth proportional to 108,063.72, 161,920.62 and 81,819.72 is: 122,597.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,063.72 : 161,920.62 = 81,819.72 : x
  2. Step 2: Convert to fraction form
    108,063.72/161,920.62 = 81,819.72/x
  3. Step 3: Cross multiply
    108,063.72x = 161,920.62 × 81,819.72
  4. Step 4: Simplify right side
    108,063.72x = 13,248,299,790.63
  5. Step 5: Solve for x
    x = 13,248,299,790.63/108,063.72
  6. Step 6: Final answer
    x = 122,597.11

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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.