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Finding the Fourth Proportional to 754.45, 1,040.31 and 492.36

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Solution

The fourth proportional to 754.45, 1,040.31 and 492.36 is: 678.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.45 : 1,040.31 = 492.36 : x
  2. Step 2: Convert to fraction form
    754.45/1,040.31 = 492.36/x
  3. Step 3: Cross multiply
    754.45x = 1,040.31 × 492.36
  4. Step 4: Simplify right side
    754.45x = 512,207.03
  5. Step 5: Solve for x
    x = 512,207.03/754.45
  6. Step 6: Final answer
    x = 678.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.