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Finding the Fourth Proportional to 345.20, 476.30 and 197.78

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Solution

The fourth proportional to 345.20, 476.30 and 197.78 is: 272.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.20 : 476.30 = 197.78 : x
  2. Step 2: Convert to fraction form
    345.20/476.30 = 197.78/x
  3. Step 3: Cross multiply
    345.20x = 476.30 × 197.78
  4. Step 4: Simplify right side
    345.20x = 94,202.61
  5. Step 5: Solve for x
    x = 94,202.61/345.20
  6. Step 6: Final answer
    x = 272.89

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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.