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Finding the Fourth Proportional to 620.63, 856.15 and 371.78

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Solution

The fourth proportional to 620.63, 856.15 and 371.78 is: 512.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.63 : 856.15 = 371.78 : x
  2. Step 2: Convert to fraction form
    620.63/856.15 = 371.78/x
  3. Step 3: Cross multiply
    620.63x = 856.15 × 371.78
  4. Step 4: Simplify right side
    620.63x = 318,297.45
  5. Step 5: Solve for x
    x = 318,297.45/620.63
  6. Step 6: Final answer
    x = 512.86

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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.