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Finding the Fourth Proportional to 206,028.60, 308,966.10 and 81,343.80

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Solution

The fourth proportional to 206,028.60, 308,966.10 and 81,343.80 is: 121,985.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,028.60 : 308,966.10 = 81,343.80 : x
  2. Step 2: Convert to fraction form
    206,028.60/308,966.10 = 81,343.80/x
  3. Step 3: Cross multiply
    206,028.60x = 308,966.10 × 81,343.80
  4. Step 4: Simplify right side
    206,028.60x = 25,132,476,645.18
  5. Step 5: Solve for x
    x = 25,132,476,645.18/206,028.60
  6. Step 6: Final answer
    x = 121,985.38

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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.