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Finding the Fourth Proportional to 259,376.86, 389,101.68 and 90,858.60

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Solution

The fourth proportional to 259,376.86, 389,101.68 and 90,858.60 is: 136,300.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,376.86 : 389,101.68 = 90,858.60 : x
  2. Step 2: Convert to fraction form
    259,376.86/389,101.68 = 90,858.60/x
  3. Step 3: Cross multiply
    259,376.86x = 389,101.68 × 90,858.60
  4. Step 4: Simplify right side
    259,376.86x = 35,353,233,902.45
  5. Step 5: Solve for x
    x = 35,353,233,902.45/259,376.86
  6. Step 6: Final answer
    x = 136,300.65

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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.