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Finding the Fourth Proportional to 812.31, 1,120.36 and 547.03

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Solution

The fourth proportional to 812.31, 1,120.36 and 547.03 is: 754.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.31 : 1,120.36 = 547.03 : x
  2. Step 2: Convert to fraction form
    812.31/1,120.36 = 547.03/x
  3. Step 3: Cross multiply
    812.31x = 1,120.36 × 547.03
  4. Step 4: Simplify right side
    812.31x = 612,870.53
  5. Step 5: Solve for x
    x = 612,870.53/812.31
  6. Step 6: Final answer
    x = 754.48

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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.