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Finding the Fourth Proportional to 618.12, 853 and 356.20

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Solution

The fourth proportional to 618.12, 853 and 356.20 is: 491.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.12 : 853 = 356.20 : x
  2. Step 2: Convert to fraction form
    618.12/853 = 356.20/x
  3. Step 3: Cross multiply
    618.12x = 853 × 356.20
  4. Step 4: Simplify right side
    618.12x = 303,838.60
  5. Step 5: Solve for x
    x = 303,838.60/618.12
  6. Step 6: Final answer
    x = 491.55

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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.