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Finding the Fourth Proportional to 620.82, 856.61 and 372.19

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Solution

The fourth proportional to 620.82, 856.61 and 372.19 is: 513.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.82 : 856.61 = 372.19 : x
  2. Step 2: Convert to fraction form
    620.82/856.61 = 372.19/x
  3. Step 3: Cross multiply
    620.82x = 856.61 × 372.19
  4. Step 4: Simplify right side
    620.82x = 318,821.68
  5. Step 5: Solve for x
    x = 318,821.68/620.82
  6. Step 6: Final answer
    x = 513.55

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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.