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Finding the Fourth Proportional to 260,418.89, 390,664.65 and 80,519.01

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Solution

The fourth proportional to 260,418.89, 390,664.65 and 80,519.01 is: 120,789.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,418.89 : 390,664.65 = 80,519.01 : x
  2. Step 2: Convert to fraction form
    260,418.89/390,664.65 = 80,519.01/x
  3. Step 3: Cross multiply
    260,418.89x = 390,664.65 × 80,519.01
  4. Step 4: Simplify right side
    260,418.89x = 31,455,930,860.00
  5. Step 5: Solve for x
    x = 31,455,930,860.00/260,418.89
  6. Step 6: Final answer
    x = 120,789.75

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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.