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Finding the Fourth Proportional to 618.29, 853.20 and 356.30

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Solution

The fourth proportional to 618.29, 853.20 and 356.30 is: 491.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.29 : 853.20 = 356.30 : x
  2. Step 2: Convert to fraction form
    618.29/853.20 = 356.30/x
  3. Step 3: Cross multiply
    618.29x = 853.20 × 356.30
  4. Step 4: Simplify right side
    618.29x = 303,995.16
  5. Step 5: Solve for x
    x = 303,995.16/618.29
  6. Step 6: Final answer
    x = 491.67

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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.