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Finding the Fourth Proportional to 100,195.64, 138,363.65 and 64,447.70

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Solution

The fourth proportional to 100,195.64, 138,363.65 and 64,447.70 is: 88,998.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,195.64 : 138,363.65 = 64,447.70 : x
  2. Step 2: Convert to fraction form
    100,195.64/138,363.65 = 64,447.70/x
  3. Step 3: Cross multiply
    100,195.64x = 138,363.65 × 64,447.70
  4. Step 4: Simplify right side
    100,195.64x = 8,917,217,992.05
  5. Step 5: Solve for x
    x = 8,917,217,992.05/100,195.64
  6. Step 6: Final answer
    x = 88,998.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.