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Finding the Fourth Proportional to 620.94, 856.11 and 521.73

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Solution

The fourth proportional to 620.94, 856.11 and 521.73 is: 719.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.94 : 856.11 = 521.73 : x
  2. Step 2: Convert to fraction form
    620.94/856.11 = 521.73/x
  3. Step 3: Cross multiply
    620.94x = 856.11 × 521.73
  4. Step 4: Simplify right side
    620.94x = 446,658.27
  5. Step 5: Solve for x
    x = 446,658.27/620.94
  6. Step 6: Final answer
    x = 719.33

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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.