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Finding the Fourth Proportional to 339.09, 505.34 and 330.89

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Solution

The fourth proportional to 339.09, 505.34 and 330.89 is: 493.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.09 : 505.34 = 330.89 : x
  2. Step 2: Convert to fraction form
    339.09/505.34 = 330.89/x
  3. Step 3: Cross multiply
    339.09x = 505.34 × 330.89
  4. Step 4: Simplify right side
    339.09x = 167,209.01
  5. Step 5: Solve for x
    x = 167,209.01/339.09
  6. Step 6: Final answer
    x = 493.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.