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Finding the Fourth Proportional to 756.26, 1,133.45 and 427.18

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Solution

The fourth proportional to 756.26, 1,133.45 and 427.18 is: 640.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.26 : 1,133.45 = 427.18 : x
  2. Step 2: Convert to fraction form
    756.26/1,133.45 = 427.18/x
  3. Step 3: Cross multiply
    756.26x = 1,133.45 × 427.18
  4. Step 4: Simplify right side
    756.26x = 484,179.37
  5. Step 5: Solve for x
    x = 484,179.37/756.26
  6. Step 6: Final answer
    x = 640.23

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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.