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Finding the Fourth Proportional to 346.21, 477.56 and 198.79

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Solution

The fourth proportional to 346.21, 477.56 and 198.79 is: 274.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.21 : 477.56 = 198.79 : x
  2. Step 2: Convert to fraction form
    346.21/477.56 = 198.79/x
  3. Step 3: Cross multiply
    346.21x = 477.56 × 198.79
  4. Step 4: Simplify right side
    346.21x = 94,933.46
  5. Step 5: Solve for x
    x = 94,933.46/346.21
  6. Step 6: Final answer
    x = 274.21

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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.