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Finding the Fourth Proportional to 169,978.60, 254,967.90 and 81,405.10

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Solution

The fourth proportional to 169,978.60, 254,967.90 and 81,405.10 is: 122,107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,978.60 : 254,967.90 = 81,405.10 : x
  2. Step 2: Convert to fraction form
    169,978.60/254,967.90 = 81,405.10/x
  3. Step 3: Cross multiply
    169,978.60x = 254,967.90 × 81,405.10
  4. Step 4: Simplify right side
    169,978.60x = 20,755,687,396.29
  5. Step 5: Solve for x
    x = 20,755,687,396.29/169,978.60
  6. Step 6: Final answer
    x = 122,107.65

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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.