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Finding the Fourth Proportional to 618.16, 853.79 and 492.55

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Solution

The fourth proportional to 618.16, 853.79 and 492.55 is: 680.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.16 : 853.79 = 492.55 : x
  2. Step 2: Convert to fraction form
    618.16/853.79 = 492.55/x
  3. Step 3: Cross multiply
    618.16x = 853.79 × 492.55
  4. Step 4: Simplify right side
    618.16x = 420,534.26
  5. Step 5: Solve for x
    x = 420,534.26/618.16
  6. Step 6: Final answer
    x = 680.30

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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.