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Finding the Fourth Proportional to 345.82, 477.13 and 198.40

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Solution

The fourth proportional to 345.82, 477.13 and 198.40 is: 273.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.82 : 477.13 = 198.40 : x
  2. Step 2: Convert to fraction form
    345.82/477.13 = 198.40/x
  3. Step 3: Cross multiply
    345.82x = 477.13 × 198.40
  4. Step 4: Simplify right side
    345.82x = 94,662.59
  5. Step 5: Solve for x
    x = 94,662.59/345.82
  6. Step 6: Final answer
    x = 273.73

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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.