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Finding the Fourth Proportional to 754.56, 1,131.84 and 429.26

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Solution

The fourth proportional to 754.56, 1,131.84 and 429.26 is: 643.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.56 : 1,131.84 = 429.26 : x
  2. Step 2: Convert to fraction form
    754.56/1,131.84 = 429.26/x
  3. Step 3: Cross multiply
    754.56x = 1,131.84 × 429.26
  4. Step 4: Simplify right side
    754.56x = 485,853.64
  5. Step 5: Solve for x
    x = 485,853.64/754.56
  6. Step 6: Final answer
    x = 643.89

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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.