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Finding the Fourth Proportional to 756.72, 1,135.69 and 391.61

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Solution

The fourth proportional to 756.72, 1,135.69 and 391.61 is: 587.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.72 : 1,135.69 = 391.61 : x
  2. Step 2: Convert to fraction form
    756.72/1,135.69 = 391.61/x
  3. Step 3: Cross multiply
    756.72x = 1,135.69 × 391.61
  4. Step 4: Simplify right side
    756.72x = 444,739.92
  5. Step 5: Solve for x
    x = 444,739.92/756.72
  6. Step 6: Final answer
    x = 587.72

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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.