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Finding the Fourth Proportional to 345.11, 476.21 and 197.69

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Solution

The fourth proportional to 345.11, 476.21 and 197.69 is: 272.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.11 : 476.21 = 197.69 : x
  2. Step 2: Convert to fraction form
    345.11/476.21 = 197.69/x
  3. Step 3: Cross multiply
    345.11x = 476.21 × 197.69
  4. Step 4: Simplify right side
    345.11x = 94,139.57
  5. Step 5: Solve for x
    x = 94,139.57/345.11
  6. Step 6: Final answer
    x = 272.79

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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.