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Finding the Fourth Proportional to 620.39, 856.00 and 371.66

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Solution

The fourth proportional to 620.39, 856.00 and 371.66 is: 512.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.39 : 856.00 = 371.66 : x
  2. Step 2: Convert to fraction form
    620.39/856.00 = 371.66/x
  3. Step 3: Cross multiply
    620.39x = 856.00 × 371.66
  4. Step 4: Simplify right side
    620.39x = 318,142.17
  5. Step 5: Solve for x
    x = 318,142.17/620.39
  6. Step 6: Final answer
    x = 512.81

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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.