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Finding the Fourth Proportional to 618.77, 853.88 and 338.99

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Solution

The fourth proportional to 618.77, 853.88 and 338.99 is: 467.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.77 : 853.88 = 338.99 : x
  2. Step 2: Convert to fraction form
    618.77/853.88 = 338.99/x
  3. Step 3: Cross multiply
    618.77x = 853.88 × 338.99
  4. Step 4: Simplify right side
    618.77x = 289,458.49
  5. Step 5: Solve for x
    x = 289,458.49/618.77
  6. Step 6: Final answer
    x = 467.80

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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.