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Finding the Fourth Proportional to 104,884.70, 156,981.45 and 81,383.90

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Solution

The fourth proportional to 104,884.70, 156,981.45 and 81,383.90 is: 121,807.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,884.70 : 156,981.45 = 81,383.90 : x
  2. Step 2: Convert to fraction form
    104,884.70/156,981.45 = 81,383.90/x
  3. Step 3: Cross multiply
    104,884.70x = 156,981.45 × 81,383.90
  4. Step 4: Simplify right side
    104,884.70x = 12,775,762,628.66
  5. Step 5: Solve for x
    x = 12,775,762,628.66/104,884.70
  6. Step 6: Final answer
    x = 121,807.69

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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.