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Finding the Fourth Proportional to 100,604.60, 138,794.54 and 64,815.48

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Solution

The fourth proportional to 100,604.60, 138,794.54 and 64,815.48 is: 89,419.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,604.60 : 138,794.54 = 64,815.48 : x
  2. Step 2: Convert to fraction form
    100,604.60/138,794.54 = 64,815.48/x
  3. Step 3: Cross multiply
    100,604.60x = 138,794.54 × 64,815.48
  4. Step 4: Simplify right side
    100,604.60x = 8,996,034,407.40
  5. Step 5: Solve for x
    x = 8,996,034,407.40/100,604.60
  6. Step 6: Final answer
    x = 89,419.72

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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.