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Finding the Fourth Proportional to 756.76, 1,135.50 and 391.48

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Solution

The fourth proportional to 756.76, 1,135.50 and 391.48 is: 587.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.76 : 1,135.50 = 391.48 : x
  2. Step 2: Convert to fraction form
    756.76/1,135.50 = 391.48/x
  3. Step 3: Cross multiply
    756.76x = 1,135.50 × 391.48
  4. Step 4: Simplify right side
    756.76x = 444,525.54
  5. Step 5: Solve for x
    x = 444,525.54/756.76
  6. Step 6: Final answer
    x = 587.41

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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.