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Finding the Fourth Proportional to 260,308.93, 390,500.43 and 80,409.64

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Solution

The fourth proportional to 260,308.93, 390,500.43 and 80,409.64 is: 120,625.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,308.93 : 390,500.43 = 80,409.64 : x
  2. Step 2: Convert to fraction form
    260,308.93/390,500.43 = 80,409.64/x
  3. Step 3: Cross multiply
    260,308.93x = 390,500.43 × 80,409.64
  4. Step 4: Simplify right side
    260,308.93x = 31,399,998,996.15
  5. Step 5: Solve for x
    x = 31,399,998,996.15/260,308.93
  6. Step 6: Final answer
    x = 120,625.90

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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.