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Finding the Fourth Proportional to 104,889.20, 156,988.20 and 81,388.40

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Solution

The fourth proportional to 104,889.20, 156,988.20 and 81,388.40 is: 121,814.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,889.20 : 156,988.20 = 81,388.40 : x
  2. Step 2: Convert to fraction form
    104,889.20/156,988.20 = 81,388.40/x
  3. Step 3: Cross multiply
    104,889.20x = 156,988.20 × 81,388.40
  4. Step 4: Simplify right side
    104,889.20x = 12,777,018,416.88
  5. Step 5: Solve for x
    x = 12,777,018,416.88/104,889.20
  6. Step 6: Final answer
    x = 121,814.43

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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.