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Finding the Fourth Proportional to 345.21, 476.38 and 197.74

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Solution

The fourth proportional to 345.21, 476.38 and 197.74 is: 272.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.21 : 476.38 = 197.74 : x
  2. Step 2: Convert to fraction form
    345.21/476.38 = 197.74/x
  3. Step 3: Cross multiply
    345.21x = 476.38 × 197.74
  4. Step 4: Simplify right side
    345.21x = 94,199.38
  5. Step 5: Solve for x
    x = 94,199.38/345.21
  6. Step 6: Final answer
    x = 272.88

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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.