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Finding the Fourth Proportional to 138,654.03, 207,981.03 and 45,159.78

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Solution

The fourth proportional to 138,654.03, 207,981.03 and 45,159.78 is: 67,739.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,654.03 : 207,981.03 = 45,159.78 : x
  2. Step 2: Convert to fraction form
    138,654.03/207,981.03 = 45,159.78/x
  3. Step 3: Cross multiply
    138,654.03x = 207,981.03 × 45,159.78
  4. Step 4: Simplify right side
    138,654.03x = 9,392,377,558.97
  5. Step 5: Solve for x
    x = 9,392,377,558.97/138,654.03
  6. Step 6: Final answer
    x = 67,739.67

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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.