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Finding the Fourth Proportional to 1,153.09, 1,729.64 and 765.55

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Solution

The fourth proportional to 1,153.09, 1,729.64 and 765.55 is: 1,148.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.09 : 1,729.64 = 765.55 : x
  2. Step 2: Convert to fraction form
    1,153.09/1,729.64 = 765.55/x
  3. Step 3: Cross multiply
    1,153.09x = 1,729.64 × 765.55
  4. Step 4: Simplify right side
    1,153.09x = 1,324,125.90
  5. Step 5: Solve for x
    x = 1,324,125.90/1,153.09
  6. Step 6: Final answer
    x = 1,148.33

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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.