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Finding the Fourth Proportional to 138,165.88, 190,668.92 and 78,549.88

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Solution

The fourth proportional to 138,165.88, 190,668.92 and 78,549.88 is: 108,398.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,165.88 : 190,668.92 = 78,549.88 : x
  2. Step 2: Convert to fraction form
    138,165.88/190,668.92 = 78,549.88/x
  3. Step 3: Cross multiply
    138,165.88x = 190,668.92 × 78,549.88
  4. Step 4: Simplify right side
    138,165.88x = 14,977,020,785.73
  5. Step 5: Solve for x
    x = 14,977,020,785.73/138,165.88
  6. Step 6: Final answer
    x = 108,398.84

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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.