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Finding the Fourth Proportional to 618.55, 853.56 and 338.76

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Solution

The fourth proportional to 618.55, 853.56 and 338.76 is: 467.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.55 : 853.56 = 338.76 : x
  2. Step 2: Convert to fraction form
    618.55/853.56 = 338.76/x
  3. Step 3: Cross multiply
    618.55x = 853.56 × 338.76
  4. Step 4: Simplify right side
    618.55x = 289,151.99
  5. Step 5: Solve for x
    x = 289,151.99/618.55
  6. Step 6: Final answer
    x = 467.47

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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.