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Finding the Fourth Proportional to 757.16, 1,135.63 and 391.85

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Solution

The fourth proportional to 757.16, 1,135.63 and 391.85 is: 587.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.16 : 1,135.63 = 391.85 : x
  2. Step 2: Convert to fraction form
    757.16/1,135.63 = 391.85/x
  3. Step 3: Cross multiply
    757.16x = 1,135.63 × 391.85
  4. Step 4: Simplify right side
    757.16x = 444,996.62
  5. Step 5: Solve for x
    x = 444,996.62/757.16
  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.