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Finding the Fourth Proportional to 621.09, 930.99 and 210.09

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Solution

The fourth proportional to 621.09, 930.99 and 210.09 is: 314.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.09 : 930.99 = 210.09 : x
  2. Step 2: Convert to fraction form
    621.09/930.99 = 210.09/x
  3. Step 3: Cross multiply
    621.09x = 930.99 × 210.09
  4. Step 4: Simplify right side
    621.09x = 195,585.98
  5. Step 5: Solve for x
    x = 195,585.98/621.09
  6. Step 6: Final answer
    x = 314.91

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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.