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Finding the Fourth Proportional to 109,881.20, 164,821.80 and 87,330.80

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Solution

The fourth proportional to 109,881.20, 164,821.80 and 87,330.80 is: 130,996.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,881.20 : 164,821.80 = 87,330.80 : x
  2. Step 2: Convert to fraction form
    109,881.20/164,821.80 = 87,330.80/x
  3. Step 3: Cross multiply
    109,881.20x = 164,821.80 × 87,330.80
  4. Step 4: Simplify right side
    109,881.20x = 14,394,019,651.44
  5. Step 5: Solve for x
    x = 14,394,019,651.44/109,881.20
  6. Step 6: Final answer
    x = 130,996.20

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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.