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Finding the Fourth Proportional to 109,919.80, 164,879.70 and 76,677.40

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Solution

The fourth proportional to 109,919.80, 164,879.70 and 76,677.40 is: 115,016.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,919.80 : 164,879.70 = 76,677.40 : x
  2. Step 2: Convert to fraction form
    109,919.80/164,879.70 = 76,677.40/x
  3. Step 3: Cross multiply
    109,919.80x = 164,879.70 × 76,677.40
  4. Step 4: Simplify right side
    109,919.80x = 12,642,546,708.78
  5. Step 5: Solve for x
    x = 12,642,546,708.78/109,919.80
  6. Step 6: Final answer
    x = 115,016.10

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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.