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Finding the Fourth Proportional to 620.43, 856.05 and 371.64

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Solution

The fourth proportional to 620.43, 856.05 and 371.64 is: 512.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.43 : 856.05 = 371.64 : x
  2. Step 2: Convert to fraction form
    620.43/856.05 = 371.64/x
  3. Step 3: Cross multiply
    620.43x = 856.05 × 371.64
  4. Step 4: Simplify right side
    620.43x = 318,142.42
  5. Step 5: Solve for x
    x = 318,142.42/620.43
  6. Step 6: Final answer
    x = 512.78

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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.