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Finding the Fourth Proportional to 621.03, 930.94 and 209.88

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Solution

The fourth proportional to 621.03, 930.94 and 209.88 is: 314.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.03 : 930.94 = 209.88 : x
  2. Step 2: Convert to fraction form
    621.03/930.94 = 209.88/x
  3. Step 3: Cross multiply
    621.03x = 930.94 × 209.88
  4. Step 4: Simplify right side
    621.03x = 195,385.16
  5. Step 5: Solve for x
    x = 195,385.16/621.03
  6. Step 6: Final answer
    x = 314.61

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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.