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Finding the Fourth Proportional to 757.04, 1,135.82 and 391.60

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Solution

The fourth proportional to 757.04, 1,135.82 and 391.60 is: 587.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.04 : 1,135.82 = 391.60 : x
  2. Step 2: Convert to fraction form
    757.04/1,135.82 = 391.60/x
  3. Step 3: Cross multiply
    757.04x = 1,135.82 × 391.60
  4. Step 4: Simplify right side
    757.04x = 444,787.11
  5. Step 5: Solve for x
    x = 444,787.11/757.04
  6. Step 6: Final answer
    x = 587.53

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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.