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Finding the Fourth Proportional to 618.56, 849.40 and 553.04

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Solution

The fourth proportional to 618.56, 849.40 and 553.04 is: 759.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.56 : 849.40 = 553.04 : x
  2. Step 2: Convert to fraction form
    618.56/849.40 = 553.04/x
  3. Step 3: Cross multiply
    618.56x = 849.40 × 553.04
  4. Step 4: Simplify right side
    618.56x = 469,752.18
  5. Step 5: Solve for x
    x = 469,752.18/618.56
  6. Step 6: Final answer
    x = 759.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.