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Finding the Fourth Proportional to 2,325.89, 3,489.40 and 765.80

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Solution

The fourth proportional to 2,325.89, 3,489.40 and 765.80 is: 1,148.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,325.89 : 3,489.40 = 765.80 : x
  2. Step 2: Convert to fraction form
    2,325.89/3,489.40 = 765.80/x
  3. Step 3: Cross multiply
    2,325.89x = 3,489.40 × 765.80
  4. Step 4: Simplify right side
    2,325.89x = 2,672,200.90
  5. Step 5: Solve for x
    x = 2,672,200.90/2,325.89
  6. Step 6: Final answer
    x = 1,148.89

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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.