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Finding the Fourth Proportional to 279,009.80, 418,611.90 and 121,351.40

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Solution

The fourth proportional to 279,009.80, 418,611.90 and 121,351.40 is: 182,069.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,009.80 : 418,611.90 = 121,351.40 : x
  2. Step 2: Convert to fraction form
    279,009.80/418,611.90 = 121,351.40/x
  3. Step 3: Cross multiply
    279,009.80x = 418,611.90 × 121,351.40
  4. Step 4: Simplify right side
    279,009.80x = 50,799,140,121.66
  5. Step 5: Solve for x
    x = 50,799,140,121.66/279,009.80
  6. Step 6: Final answer
    x = 182,069.38

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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.