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Finding the Fourth Proportional to 756.87, 1,133.66 and 345.39

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Solution

The fourth proportional to 756.87, 1,133.66 and 345.39 is: 517.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.87 : 1,133.66 = 345.39 : x
  2. Step 2: Convert to fraction form
    756.87/1,133.66 = 345.39/x
  3. Step 3: Cross multiply
    756.87x = 1,133.66 × 345.39
  4. Step 4: Simplify right side
    756.87x = 391,553.10
  5. Step 5: Solve for x
    x = 391,553.10/756.87
  6. Step 6: Final answer
    x = 517.33

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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.