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Finding the Fourth Proportional to 618.13, 853.16 and 356.30

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Solution

The fourth proportional to 618.13, 853.16 and 356.30 is: 491.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.13 : 853.16 = 356.30 : x
  2. Step 2: Convert to fraction form
    618.13/853.16 = 356.30/x
  3. Step 3: Cross multiply
    618.13x = 853.16 × 356.30
  4. Step 4: Simplify right side
    618.13x = 303,980.91
  5. Step 5: Solve for x
    x = 303,980.91/618.13
  6. Step 6: Final answer
    x = 491.78

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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.