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Finding the Fourth Proportional to 756.73, 1,135.44 and 391.32

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Solution

The fourth proportional to 756.73, 1,135.44 and 391.32 is: 587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.73 : 1,135.44 = 391.32 : x
  2. Step 2: Convert to fraction form
    756.73/1,135.44 = 391.32/x
  3. Step 3: Cross multiply
    756.73x = 1,135.44 × 391.32
  4. Step 4: Simplify right side
    756.73x = 444,320.38
  5. Step 5: Solve for x
    x = 444,320.38/756.73
  6. Step 6: Final answer
    x = 587.16

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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.