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Finding the Fourth Proportional to 618.74, 853.85 and 356.75

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Solution

The fourth proportional to 618.74, 853.85 and 356.75 is: 492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.74 : 853.85 = 356.75 : x
  2. Step 2: Convert to fraction form
    618.74/853.85 = 356.75/x
  3. Step 3: Cross multiply
    618.74x = 853.85 × 356.75
  4. Step 4: Simplify right side
    618.74x = 304,610.99
  5. Step 5: Solve for x
    x = 304,610.99/618.74
  6. Step 6: Final answer
    x = 492.31

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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.