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Finding the Fourth Proportional to 618.79, 853.93 and 339.02

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Solution

The fourth proportional to 618.79, 853.93 and 339.02 is: 467.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.79 : 853.93 = 339.02 : x
  2. Step 2: Convert to fraction form
    618.79/853.93 = 339.02/x
  3. Step 3: Cross multiply
    618.79x = 853.93 × 339.02
  4. Step 4: Simplify right side
    618.79x = 289,499.35
  5. Step 5: Solve for x
    x = 289,499.35/618.79
  6. Step 6: Final answer
    x = 467.85

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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.