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Finding the Fourth Proportional to 620.73, 931.09 and 209.87

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Solution

The fourth proportional to 620.73, 931.09 and 209.87 is: 314.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.73 : 931.09 = 209.87 : x
  2. Step 2: Convert to fraction form
    620.73/931.09 = 209.87/x
  3. Step 3: Cross multiply
    620.73x = 931.09 × 209.87
  4. Step 4: Simplify right side
    620.73x = 195,403.86
  5. Step 5: Solve for x
    x = 195,403.86/620.73
  6. Step 6: Final answer
    x = 314.80

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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.