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Finding the Fourth Proportional to 757.20, 1,135.58 and 270.39

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Solution

The fourth proportional to 757.20, 1,135.58 and 270.39 is: 405.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.20 : 1,135.58 = 270.39 : x
  2. Step 2: Convert to fraction form
    757.20/1,135.58 = 270.39/x
  3. Step 3: Cross multiply
    757.20x = 1,135.58 × 270.39
  4. Step 4: Simplify right side
    757.20x = 307,048.12
  5. Step 5: Solve for x
    x = 307,048.12/757.20
  6. Step 6: Final answer
    x = 405.50

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1.5x scale

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.