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Finding the Fourth Proportional to 618.43, 853.51 and 397.43

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Solution

The fourth proportional to 618.43, 853.51 and 397.43 is: 548.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.43 : 853.51 = 397.43 : x
  2. Step 2: Convert to fraction form
    618.43/853.51 = 397.43/x
  3. Step 3: Cross multiply
    618.43x = 853.51 × 397.43
  4. Step 4: Simplify right side
    618.43x = 339,210.48
  5. Step 5: Solve for x
    x = 339,210.48/618.43
  6. Step 6: Final answer
    x = 548.50

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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.