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Finding the Fourth Proportional to 618.90, 853.94 and 356.84

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Solution

The fourth proportional to 618.90, 853.94 and 356.84 is: 492.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.90 : 853.94 = 356.84 : x
  2. Step 2: Convert to fraction form
    618.90/853.94 = 356.84/x
  3. Step 3: Cross multiply
    618.90x = 853.94 × 356.84
  4. Step 4: Simplify right side
    618.90x = 304,719.95
  5. Step 5: Solve for x
    x = 304,719.95/618.90
  6. Step 6: Final answer
    x = 492.36

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1.5x scale

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.