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Finding the Fourth Proportional to 618.66, 853.70 and 356.63

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Solution

The fourth proportional to 618.66, 853.70 and 356.63 is: 492.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.66 : 853.70 = 356.63 : x
  2. Step 2: Convert to fraction form
    618.66/853.70 = 356.63/x
  3. Step 3: Cross multiply
    618.66x = 853.70 × 356.63
  4. Step 4: Simplify right side
    618.66x = 304,448.98
  5. Step 5: Solve for x
    x = 304,448.98/618.66
  6. Step 6: Final answer
    x = 492.11

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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.