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Finding the Fourth Proportional to 345.78, 477.19 and 198.39

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Solution

The fourth proportional to 345.78, 477.19 and 198.39 is: 273.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.78 : 477.19 = 198.39 : x
  2. Step 2: Convert to fraction form
    345.78/477.19 = 198.39/x
  3. Step 3: Cross multiply
    345.78x = 477.19 × 198.39
  4. Step 4: Simplify right side
    345.78x = 94,668.41
  5. Step 5: Solve for x
    x = 94,668.41/345.78
  6. Step 6: Final answer
    x = 273.78

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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.