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Finding the Fourth Proportional to 349.38, 479.05 and 342.09

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Solution

The fourth proportional to 349.38, 479.05 and 342.09 is: 469.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.38 : 479.05 = 342.09 : x
  2. Step 2: Convert to fraction form
    349.38/479.05 = 342.09/x
  3. Step 3: Cross multiply
    349.38x = 479.05 × 342.09
  4. Step 4: Simplify right side
    349.38x = 163,877.36
  5. Step 5: Solve for x
    x = 163,877.36/349.38
  6. Step 6: Final answer
    x = 469.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.