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Finding the Fourth Proportional to 621.84, 932.90 and 211

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Solution

The fourth proportional to 621.84, 932.90 and 211 is: 316.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.84 : 932.90 = 211 : x
  2. Step 2: Convert to fraction form
    621.84/932.90 = 211/x
  3. Step 3: Cross multiply
    621.84x = 932.90 × 211
  4. Step 4: Simplify right side
    621.84x = 196,841.90
  5. Step 5: Solve for x
    x = 196,841.90/621.84
  6. Step 6: Final answer
    x = 316.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.