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Finding the Fourth Proportional to 756.39, 1,135.05 and 269.40

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Solution

The fourth proportional to 756.39, 1,135.05 and 269.40 is: 404.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.39 : 1,135.05 = 269.40 : x
  2. Step 2: Convert to fraction form
    756.39/1,135.05 = 269.40/x
  3. Step 3: Cross multiply
    756.39x = 1,135.05 × 269.40
  4. Step 4: Simplify right side
    756.39x = 305,782.47
  5. Step 5: Solve for x
    x = 305,782.47/756.39
  6. Step 6: Final answer
    x = 404.27

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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.